[cloud_firestore,firebase_database,firebase_storage] handling error = nil on getFlutterError (#1274)

When `getFlutterError` was introduced(https://github.com/flutter/plugins/pull/1226), some plugins started to throw exceptions for successful operations. This fixed the issue. Related issues include flutter/flutter#28344; flutter/flutter#28065; flutter/flutter#28103
It also fixed an unintentional typo introduced in the same PR.(https://github.com/flutter/plugins/pull/1226) 
diff --git a/packages/cloud_firestore/CHANGELOG.md b/packages/cloud_firestore/CHANGELOG.md
index 7b5e33f..153ba08 100644
--- a/packages/cloud_firestore/CHANGELOG.md
+++ b/packages/cloud_firestore/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.9.5+2
+
+* Fixing PlatformException(Error 0, null, null) which happened when a successful operation was performed.
+
 ## 0.9.5+1
 
 * Log messages about automatic configuration of the default app are now less confusing.
diff --git a/packages/cloud_firestore/ios/Classes/CloudFirestorePlugin.m b/packages/cloud_firestore/ios/Classes/CloudFirestorePlugin.m
index ca56ec3..6a4850c 100644
--- a/packages/cloud_firestore/ios/Classes/CloudFirestorePlugin.m
+++ b/packages/cloud_firestore/ios/Classes/CloudFirestorePlugin.m
@@ -7,7 +7,9 @@
 #import <Firebase/Firebase.h>
 
 static FlutterError *getFlutterError(NSError *error) {
-  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %d", (int)error.code]
+  if (error == nil) return nil;
+
+  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %ld", error.code]
                              message:error.domain
                              details:error.localizedDescription];
 }
diff --git a/packages/cloud_firestore/pubspec.yaml b/packages/cloud_firestore/pubspec.yaml
index c95162a..9875d6d 100755
--- a/packages/cloud_firestore/pubspec.yaml
+++ b/packages/cloud_firestore/pubspec.yaml
@@ -3,7 +3,7 @@
   live synchronization and offline support on Android and iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/cloud_firestore
-version: 0.9.5+1
+version: 0.9.5+2
 
 flutter:
   plugin:
diff --git a/packages/firebase_database/CHANGELOG.md b/packages/firebase_database/CHANGELOG.md
index 4b6b090..50178e9 100644
--- a/packages/firebase_database/CHANGELOG.md
+++ b/packages/firebase_database/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.1+3
+
+* Fixing DatabaseReference.set unhandled exception which happened when a successful operation was performed.
+
 ## 2.0.1+2
 
 * Log messages about automatic configuration of the default app are now less confusing.
diff --git a/packages/firebase_database/ios/Classes/FirebaseDatabasePlugin.m b/packages/firebase_database/ios/Classes/FirebaseDatabasePlugin.m
index b375a44..e9b09cb 100644
--- a/packages/firebase_database/ios/Classes/FirebaseDatabasePlugin.m
+++ b/packages/firebase_database/ios/Classes/FirebaseDatabasePlugin.m
@@ -7,7 +7,9 @@
 #import <Firebase/Firebase.h>
 
 static FlutterError *getFlutterError(NSError *error) {
-  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %d", (int)error.code]
+  if (error == nil) return nil;
+
+  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %ld", error.code]
                              message:error.domain
                              details:error.localizedDescription];
 }
diff --git a/packages/firebase_database/pubspec.yaml b/packages/firebase_database/pubspec.yaml
index f0c1dbc..f5189b7 100755
--- a/packages/firebase_database/pubspec.yaml
+++ b/packages/firebase_database/pubspec.yaml
@@ -3,7 +3,7 @@
   with realtime data syncing across Android and iOS clients, and offline access.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/firebase_database
-version: 2.0.1+1
+version: 2.0.1+3
 
 flutter:
   plugin:
diff --git a/packages/firebase_storage/CHANGELOG.md b/packages/firebase_storage/CHANGELOG.md
index 9d16936..822a74b 100644
--- a/packages/firebase_storage/CHANGELOG.md
+++ b/packages/firebase_storage/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.1.0+1
+
+* Reverting error.code casting/formatting to what it was until version 2.0.1.
+
 ## 2.1.0
 
 * Added support for getReferenceFromUrl.
diff --git a/packages/firebase_storage/ios/Classes/FirebaseStoragePlugin.m b/packages/firebase_storage/ios/Classes/FirebaseStoragePlugin.m
index 70027ed..ced82f7 100644
--- a/packages/firebase_storage/ios/Classes/FirebaseStoragePlugin.m
+++ b/packages/firebase_storage/ios/Classes/FirebaseStoragePlugin.m
@@ -7,7 +7,7 @@
 #import <Firebase/Firebase.h>
 
 static FlutterError *getFlutterError(NSError *error) {
-  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %d", (int)error.code]
+  return [FlutterError errorWithCode:[NSString stringWithFormat:@"Error %ld", (long)error.code]
                              message:error.domain
                              details:error.localizedDescription];
 }
diff --git a/packages/firebase_storage/pubspec.yaml b/packages/firebase_storage/pubspec.yaml
index 9216639..6bca906 100755
--- a/packages/firebase_storage/pubspec.yaml
+++ b/packages/firebase_storage/pubspec.yaml
@@ -3,7 +3,7 @@
   cost-effective object storage service for Android and iOS.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/firebase_storage
-version: 2.1.0
+version: 2.1.0+1
 
 flutter:
   plugin: