[libclang] Fix crash on invalid code. Fixes rdar://10451854

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@144766 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseObjc.cpp b/lib/Parse/ParseObjc.cpp
index 88044d1..3cb2aaa 100644
--- a/lib/Parse/ParseObjc.cpp
+++ b/lib/Parse/ParseObjc.cpp
@@ -1487,7 +1487,8 @@
   Actions.DefaultSynthesizeProperties(getCurScope(), ObjCImpDecl);
   for (size_t i = 0; i < LateParsedObjCMethods.size(); ++i) {
     Decl *D = ParseLexedObjCMethodDefs(*LateParsedObjCMethods[i]);
-    DeclsInGroup.push_back(D);
+    if (D)
+      DeclsInGroup.push_back(D);
   }
   DeclsInGroup.push_back(ObjCImpDecl);