Update examples/workflow-test/scripts/repositories.ts

Co-authored-by: Haydar Metin <hmetin@eclipsesource.com>

examples/workflow-test/scripts/repositories.ts

@@ -90,7 +90,9 @@ function buildClient(options: GlobalOptions): void {
 }
 
 function buildTheia(options: GlobalOptions): void {
-    exec('yarn && yarn browser build', [], { cwd: repositoryFolder(options.folder, theiaRepository) });
+    if(exec('yarn', [], { cwd: repositoryFolder(options.folder, theiaRepository)})) {
+        exec('yarn', ['browser', 'build'], { cwd: repositoryFolder(options.folder, theiaRepository) });
+    }
 }
 
 function buildVSCode(options: GlobalOptions): void {