:recycle: remove unnecessary if

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/conversions/to_json.hpp

diff --git a/include/nlohmann/detail/conversions/to_json.hpp b/include/nlohmann/detail/conversions/to_json.hpp
index 3626593..23e15b0 100644
--- a/include/nlohmann/detail/conversions/to_json.hpp
+++ b/include/nlohmann/detail/conversions/to_json.hpp
@@ -214,10 +214,7 @@
         j.m_data.m_type = value_t::array;
         j.m_data.m_value = value_t::array;
         j.m_data.m_value.array->resize(arr.size());
-        if (arr.size() > 0)
-        {
-            std::copy(std::begin(arr), std::end(arr), j.m_data.m_value.array->begin());
-        }
+        std::copy(std::begin(arr), std::end(arr), j.m_data.m_value.array->begin());
         j.set_parents();
         j.assert_invariant();
     }

single_include/nlohmann/json.hpp

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 65b3b34..04f4594 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -6023,10 +6023,7 @@
         j.m_data.m_type = value_t::array;
         j.m_data.m_value = value_t::array;
         j.m_data.m_value.array->resize(arr.size());
-        if (arr.size() > 0)
-        {
-            std::copy(std::begin(arr), std::end(arr), j.m_data.m_value.array->begin());
-        }
+        std::copy(std::begin(arr), std::end(arr), j.m_data.m_value.array->begin());
         j.set_parents();
         j.assert_invariant();
     }