Tiny syntax cleanup

Author: kevmoo

lib/src/builder.dart

@@ -94,10 +94,7 @@ class _Builder extends Builder {
 
     if (!_isStandalone) {
       var asset = buildStep.inputId;
-      var name = nameOfPartial(
-        library,
-        asset,
-      );
+      var name = nameOfPartial(library, asset);
       if (name == null) {
         var suggest = suggestLibraryName(asset);
         throw new InvalidGenerationSourceError(

lib/src/generator.dart

@@ -37,7 +37,7 @@ class InvalidGenerationSourceError extends Error {
   final String todo;
 
   InvalidGenerationSourceError(this.message, {String todo})
-      : this.todo = todo == null ? '' : todo;
+      : this.todo = todo ?? '';
 
   @override
   String toString() => message;