mesh traverse in findElInfoAtPoint corrected for parallel

AMDiS/src/Mesh.cc

@@ -737,7 +737,10 @@ namespace AMDiS {
 		found = true;
 	      }
 	    }
-	    TEST_EXIT(found)("No macro-element found that was not visited yet!\n");
+	    if (!found) {
+	      delete mel_info;
+	      return false;
+	    }
 	  }
 	}
 	mel = active.top();