BF: catch and report exceptions while executing commands in client interactive mode (Close #353)

ChangeLog

@@ -26,6 +26,8 @@ ver. 0.8.11 (2013/XX/XXX) - loves-unittests
      - All backends, possible race condition: do not read from a file
        initially reported empty.  Originally could have lead to
        accounting for detected log lines multiple times.
+     - Do not crash if executing a command in fail2ban-client interactive
+       mode has failed (e.g. due to incorrect syntax). Closes gh-353
   Daniel Black & Мернов Георгий
    * filter.d/dovecot.conf -- Fix when no TLS enabled - line doesn't end in ,
   Daniel Black

fail2ban-client

@@ -383,7 +383,10 @@ class Fail2banClient:
 						if cmd == "help":
 							self.dispUsage()
 						elif not cmd == "":
-							self.__processCommand(shlex.split(cmd))
+							try:
+								self.__processCommand(shlex.split(cmd))
+							except Exception, e:
+								logSys.error(e)
 			except (EOFError, KeyboardInterrupt):
 				print
 				return True