fix more eslint requirements

src/loaders/ObjectLoader.js

@@ -471,7 +471,7 @@ Object.assign( ObjectLoader.prototype, {
 					var array = [];
 					for ( var j = 0; j < data.materials.length; j ++ ) {
 
-						if (cache[ data.materials[ j ].uuid ]) {
+						if ( cache[ data.materials[ j ].uuid ] ) {
 
 							array.push( cache[ data.materials[ j ].uuid ] );