csv_metadata_quality/app.py: adjust mojibake check

If unsafe fixes (-u) are enabled then we don't need to do the check
first before actually fixing them. Doing the check first creates e-
tra output that needs to be reviewed by the user.

csv_metadata_quality/app.py

@@ -109,12 +109,11 @@ def run(argv):
         # Check: suspicious characters
         df[column].apply(check.suspicious_characters, field_name=column)
 
-        # Check: mojibake
-        df[column].apply(check.mojibake, field_name=column)
-
-        # Fix: mojibake
+        # Fix: mojibake. If unsafe fixes are not enabled then we only check.
         if args.unsafe_fixes:
             df[column] = df[column].apply(fix.mojibake, field_name=column)
+        else:
+            df[column].apply(check.mojibake, field_name=column)
 
         # Fix: invalid and unnecessary multi-value separators
         df[column] = df[column].apply(fix.separators, field_name=column)