Fix unit testing crash with localization on (#3933)

Author: ryanwilson

GoogleUtilities/CHANGELOG.md

@@ -1,6 +1,7 @@
 # 6.3.1
 - Fix GULMutableDictionary keyed subscript methods. (#3882)
 - Update Networking to receive data for POST requests. (#3940)
+- Fix crash in GULLogBasic. (#3928)
 
 # 6.3.0
 - GULSecureCoding introduced. (#3707)

GoogleUtilities/Logger/GULLogger.m

@@ -161,7 +161,12 @@ void GULLogBasic(GULLoggerLevel level,
                                                                     range:messageCodeRange];
   NSCAssert(numberOfMatches == 1, @"Incorrect message code format.");
 #endif
-  NSString *logMsg = [[NSString alloc] initWithFormat:message arguments:args_ptr];
+  NSString *logMsg;
+  if (args_ptr == NULL) {
+    logMsg = message;
+  } else {
+    logMsg = [[NSString alloc] initWithFormat:message arguments:args_ptr];
+  }
   logMsg = [NSString stringWithFormat:@"%s - %@[%@] %@", sVersion, service, messageCode, logMsg];
   dispatch_async(sGULClientQueue, ^{
     asl_log(sGULLoggerClient, NULL, (int)level, "%s", logMsg.UTF8String);