- fix issue sorting a Boolean or NSNumber field that contains a nil v…

…alue for row yepher#1 (nil will get changed to NSString("") and the comparison description gets set to compareCaseInsensitive. Solution used here is to treat all objects as a string

CoreDataUtil/CoreData/MFLCoreDataIntrospection.m

@@ -319,6 +319,10 @@ + (id)getDisplayValueForObject:(id)obj dateStyle:(NSDateFormatterStyle) dateStyl
 
         return [NSString stringWithFormat:@"%ld bytes", [data length]];
     }
+    else if ([obj isKindOfClass:[NSNumber class]]) {
+        NSNumber *number = obj;
+        return [NSString stringWithFormat:@"%f", number.floatValue];
+    }
     else
     {
         return obj;