don't call showError, when there's no error

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37002 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
code formatting

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37003 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
yanpe

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37004 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4627 redirect copy/open pictures to App.copyEVtoClipboard

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37005 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4649 - fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37006 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e