[web] tidy up getPlainTooltip() etc (not supported in HTML5)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26347 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
NPE fixed: construction protocol opens even there is no toolbar icon in all row. (#3246)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26348 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e