Land all the fixes from 5609f39c but don't enable assert

core/fpdfapi/parser/cpdf_array.cpp

Index: core/fpdfapi/parser/cpdf_array.cpp
diff --git a/core/fpdfapi/parser/cpdf_array.cpp b/core/fpdfapi/parser/cpdf_array.cpp
index 9a2dba01610c80a5124cceae4755c68ac835095b..0d0c02f28dc4acf8ce4d4d1eaf34160ea3137655 100644
--- a/core/fpdfapi/parser/cpdf_array.cpp
+++ b/core/fpdfapi/parser/cpdf_array.cpp
@@ -23,7 +23,7 @@ CPDF_Array::~CPDF_Array() {
   // in case of cyclic references.
   m_ObjNum = kInvalidObjNum;
   for (auto& it : m_Objects) {
-    if (it)
+    if (it && it->GetObjNum() != kInvalidObjNum)
       it->Release();
   }
 }