Update ObjFileParser.cpp

Ensure not checking empty strings

code/AssetLib/Obj/ObjFileParser.cpp

@@ -582,11 +582,13 @@ void ObjFileParser::getMaterialDesc() {
         skip = true;
     }
 
-    // If the current mesh has the same material, we simply ignore that 'usemtl' command
+    // If the current mesh has the same material, we will ignore that 'usemtl' command
     // There is no need to create another object or even mesh here
+    if (!skip) {
         if (m_pModel->mCurrentMaterial && m_pModel->mCurrentMaterial->MaterialName == aiString(strName)) {
             skip = true;
         }
+    }
 
     if (!skip) {
         // Search for material