Avoid parser exception when Giac times out (web test needed)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35073 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4408 for Desktop

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35074 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
More than 2 EVs #4406

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35075 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Removed tablet from SVN

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35076 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e