Merge pull request #1113 from Unity-Technologies/fix-null-str-assert

Allow namespace-agnostic class lookup by passing NULL namespace.

Author: jechter

mono/metadata/class.c

@@ -7713,7 +7713,7 @@ find_nocase (gpointer key, gpointer value, gpointer user_data)
 	char *name = (char*)key;
 	FindUserData *data = (FindUserData*)user_data;
 
-	if (!data->value && (mono_utf8_strcasecmp (name, (char*)data->key) == 0))
+	if (!data->value && (NULL == data->key || (mono_utf8_strcasecmp (name, (char*)data->key) == 0)))
 		data->value = value;
 }
 
@@ -7808,7 +7808,7 @@ mono_class_from_name_case_checked (MonoImage *image, const char *name_space, con
 			continue;
 		n = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAME]);
 		nspace = mono_metadata_string_heap (image, cols [MONO_TYPEDEF_NAMESPACE]);
-		if (mono_utf8_strcasecmp (n, name) == 0 && mono_utf8_strcasecmp (nspace, name_space) == 0)
+		if (mono_utf8_strcasecmp (n, name) == 0 && (NULL == name_space || (mono_utf8_strcasecmp (nspace, name_space) == 0)))
 			return mono_class_get_checked (image, MONO_TOKEN_TYPE_DEF | i, error);
 	}
 	return NULL;