blender was crashing if no argument was given after '-t'

mesh.faces.deltete(...) with an empty list no longer returns an error.

source/blender/python/api2_2x/Mesh.c

@@ -5390,9 +5390,9 @@ static PyObject *MFaceSeq_delete( BPy_MFaceSeq * self, PyObject *args )
 
 	/* see how many args we need to parse */
 	len = PySequence_Size( args );
-	if( len < 1 )
-		return EXPP_ReturnPyObjError( PyExc_TypeError,
-				"sequence must contain at least one int or MFace" );
+	if( len < 1 ) {
+		Py_RETURN_NONE;
+	}
 
 	face_table = MEM_callocN( len*sizeof( unsigned int ),
 			"face_table" );

source/blender/render/intern/source/pipeline.c

@@ -2710,7 +2710,7 @@ void RE_set_max_threads(int threads)
 	} else if(threads>=1 && threads<=BLENDER_MAX_THREADS) {
 		commandline_threads= threads;
 	} else {
-		printf("Error, threads has to be in range 1-%d\n", BLENDER_MAX_THREADS);
+		printf("Error, threads has to be in range 0-%d\n", BLENDER_MAX_THREADS);
 	}
 }
 

source/creator/creator.c

@@ -785,11 +785,15 @@ int main(int argc, char **argv)
 				
 			case 't':
 				a++;
+				if (a < argc) {
 					if(G.background) {
 						RE_set_max_threads(atoi(argv[a]));
 					} else {
 						printf("Warning: threads can only be set in background mode\n");
 					}
+				} else {
+					printf("\nError: you must specify a number of threads between 0 and 8 '-t '.\n");
+				}
 				break;
 			case 'x': /* extension */
 				a++;