Add file_search to defaultProps
Add file_search to defaultProps

Remove checks for existance of @props.file_search and assume it to be defined.
file_search:'' added to all default props.

Changed to make the code less brittle.

sagemathinc/smc,DrXyzzy/smc,DrXyzzy/smc,sagemathinc/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,tscholl2/smc,sagemathinc/smc,tscholl2/smc,DrXyzzy/smc,tscholl2/smc,DrXyzzy/smc