Exceptions for get_keyword_tags and get_keyword_types

[sampeson]

Currently we have hidden get_keyword_tags and get_keyword_types exceptions with log4j FATAL log level. If log4j is modified by application under test these exceptions comes visible in logs. We should fix these exceptions (in area of remote library).

In remote library these Robot remote methods are located in https://github.com/ombre42/jrobotremoteserver/blob/master/src/main/java/org/robotframework/remoteserver/servlet/ServerMethods.java. There is fork of remote server that has fix for this that could be considered: https://github.com/aenniw/jrobotremoteserver

[sampeson]

This is fixed as part of jrobotremoteserver update.

[sampeson]

Fixed as part of 0.5.4 release (jrobotremoteserver).