check if the current project is not null then add it to the list of projects (#10440)

frontend/src/app/shared/components/project-include/project-include.component.ts

@@ -114,11 +114,11 @@ export class OpProjectIncludeComponent extends UntilDestroyedMixin {
         if (selectedProjectHrefs.includes(currentProjectHref)) {
           return selectedProjectHrefs;
         }
-
-        return [
-          ...selectedProjectHrefs,
-          currentProjectHref,
-        ];
+        const selectedPrjects = [...selectedProjectHrefs];
+        if (currentProjectHref) {
+          selectedPrjects.push(currentProjectHref);
+        }
+        return selectedPrjects;
       }),
     );