Toolkit: fix prettier error reporting (#21599)

packages/grafana-toolkit/src/cli/tasks/plugin.build.ts

@@ -87,7 +87,10 @@ export const prettierCheckPlugin = useSpinner<Fixable>('Prettier check', async (
         }
         }
       })
       })
       .then(newContents => {
       .then(newContents => {
-        if (fix && newContents && newContents.length > 10) {
+        if (newContents === undefined) {
+          return true; // Nothing to fix
+        } else if (fix) {
+          if (newContents.length > 10) {
             return writeFile(path, newContents)
             return writeFile(path, newContents)
               .then(() => {
               .then(() => {
                 console.log(`Fixed: ${path}`);
                 console.log(`Fixed: ${path}`);
@@ -97,12 +100,10 @@ export const prettierCheckPlugin = useSpinner<Fixable>('Prettier check', async (
                 console.log(`Error fixing ${path}`, error);
                 console.log(`Error fixing ${path}`, error);
                 return false;
                 return false;
               });
               });
-        } else if (fix) {
+          }
           console.log(`No automatic fix for: ${path}`);
           console.log(`No automatic fix for: ${path}`);
-          return false;
-        } else {
-          return false;
         }
         }
+        return false;
       })
       })
       .then(success => ({ path, success }))
       .then(success => ({ path, success }))
   );
   );