Fix ObjCLanguage::MethodName::GetCategory after r246616; I was just moving things around too fast...

llvm-svn: 246736
diff --git a/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h b/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
index 70ecf90..9c69fbf 100644
--- a/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
+++ b/lldb/source/Plugins/Language/ObjC/ObjCLanguage.h
@@ -75,7 +75,7 @@
         bool
         HasCategory()
         {
-            return !GetCategory();
+            return !GetCategory().IsEmpty();
         }
 
         Type