Make f(t)=Function[t,0,1] work with the new code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36638 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
convert Function[sin(x),1,2] to If[1<=x<=2, sin(x)] (Input Bar only) (part 3)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36639 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
convert Function[sin(x),1,2] to If[1<=x<=2, sin(x)] (CAS View)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@36640 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e