Ignore error when parsing Client row.

Explanation of bug (Why error wasn't being caught):

```
try:
    ...
except IndexError, ValueError:
    # Only catches IndexError.
    # ValueError is a *variable* holding the IndexError !
```

py/Airodump.py

@@ -193,7 +193,7 @@ class Airodump(object):
                     # The current row corresponds to a "Client" (computer)
                     try:
                         client = Client(row)
-                    except IndexError, ValueError:
+                    except (IndexError, ValueError) as e:
                         # Skip if we can't parse the client row
                         continue