If we create a new file, and it dies when we try to save it,

make sure that the save button is still enabled, and make sure we have the ability to save it. (previously, it would not save after the first error)

src/app/modeler/modeler.component.ts

@@ -168,7 +168,7 @@ export class ModelerComponent implements AfterViewInit {
   }
 
   hasChanged(): boolean {
-    return this.xml !== this.draftXml;
+    return (this.xml !== this.draftXml) || this.isNew;
   }
 
   loadDbFile(bf: FileMeta) {
@@ -314,6 +314,11 @@ export class ModelerComponent implements AfterViewInit {
         this.api.addFileMeta({workflow_spec_id: this.workflowSpec.id}, this.diagramFileMeta).subscribe(fileMeta => {
           this.router.navigate(['/modeler', this.workflowSpec.id, fileMeta.id]);
           this.snackBar.open(`Saved new file ${fileMeta.name} to workflow spec ${this.workflowSpec.name}.`, 'Ok', {duration: 5000});
+        }, x => {
+          // if this fails, we make sure that the file is treated as still new,
+          // and we make the user re-enter the file details as they weren't actually saved.
+          this.isNew = true;
+          this.diagramFileMeta = undefined;
         });
       }
     }