Doesn't draw second line when is infinite

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31412 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Circle through A, B, C gives a line when A=B or A=C

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@31413 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e