Bug fix: "Open CARTA" button should appear only if workflow_metadata has carta_url value

apps/web/src/app/workspaces/components/capability-request/components/metadata/metadata.component.html

 <div id="metadata-container" class="container-fluid rounded-top rounded-3 p-3" >
-  <div *ngIf="isEmpty(capabilityVersion.workflow_metadata) === false">
+  <div *ngIf="isEmpty(capabilityVersion.workflow_metadata) === false || hasCarta()">
     <div class="d-flex justify-content-center py-3" *ngFor="let parameter of capabilityVersion.workflow_metadata | keyvalue">
       <a
         id="carta-session-button"

apps/web/src/app/workspaces/components/capability-request/components/metadata/metadata.component.ts

@@ -48,4 +48,24 @@ export class MetadataComponent implements OnInit {
     return true;
   }
 
+  /**
+   * Is there a CARTA session for this capability version?
+   *
+   *  @return boolean  true if carta_url exists in workflow_metadata
+   */
+  hasCarta(): boolean {
+
+    // return true if workflow_metadata contains carta_url
+    if (this.capabilityVersion.workflow_metadata !== null) {
+      const metadata = this.capabilityVersion.workflow_metadata
+      if (metadata.hasOwnProperty('carta_url')) {
+        return true
+      }
+    }
+
+    return false;
+  }
+
+
+
 }