OBJReader: Fixed error with some material files containing tabs.

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@271 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/IO/reader/OBJReader.cc

@@ -172,7 +172,7 @@ read_material(std::fstream& _in)
 
     stream >> keyWrd;
 
-    if( isspace(line[0]) || line[0] == '#' )
+    if( ( isspace(line[0]) && line[0] != 0x09 /*tab*/ ) || line[0] == '#' )
     {
       if (indef && !key.empty() && mat.is_valid())
       {