NPE in stats view

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36280 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[web] cas autocomplete fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36281 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Initialize histogram as invisible

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36282 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36283 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove additional histogram from stats view again

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36284 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Remove additional histogram from stats view again: less hacky fix

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36285 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e