Remove use of try/except for flow control

If the intent is to only extract the 7th column if it exists then it
makes more sense to actually test for the number of columns rather than
catch an IndexError which may occur at any of the 3 list index
operations within the try block.

salt/modules/parted.py

@@ -135,14 +135,12 @@ def list_(device, unit=None):
                     'physical sector': cols[4],
                     'partition table': cols[5],
                     'model': cols[6]}
-                try:
+                if len(cols) == 8:
                     ret['info']['disk flags'] = cols[7]
-                except IndexError:
                     # Older parted (2.x) doesn't show disk flags in the 'print'
                     # output, and will return a 7-column output for the info
                     # line. In these cases we just leave this field out of the
                     # return dict.
-                    pass
                 mode = 'partitions'
         else:
             ret['partitions'][cols[0]] = {