Fix create snippet disabled on empty file path

It turns out the BE supports this and it works with
multi-file snippets too.

app/assets/javascripts/snippets/components/edit.vue

@@ -63,7 +63,7 @@ export default {
       return this.actions.length > 0;
     },
     hasValidBlobs() {
-      return this.actions.every(x => x.filePath && x.content);
+      return this.actions.every(x => x.content);
     },
     updatePrevented() {
       return this.snippet.title === '' || !this.hasValidBlobs || this.isUpdating;

changelogs/unreleased/239341-fix-snippets-create-without-file-path.yml

+---
+title: Fix snippet save button disabled with empty file path
+merge_request: 40412
+author:
+type: fixed

spec/frontend/snippets/components/edit_spec.js

@@ -183,7 +183,7 @@ describe('Snippet Edit app', () => {
       ${'foo'} | ${[]}                                            | ${false}
       ${'foo'} | ${[TEST_ACTIONS.VALID]}                          | ${false}
       ${'foo'} | ${[TEST_ACTIONS.VALID, TEST_ACTIONS.NO_CONTENT]} | ${true}
-      ${'foo'} | ${[TEST_ACTIONS.VALID, TEST_ACTIONS.NO_PATH]}    | ${true}
+      ${'foo'} | ${[TEST_ACTIONS.VALID, TEST_ACTIONS.NO_PATH]}    | ${false}
     `(
       'should handle submit disable (title=$title, actions=$actions, shouldDisable=$shouldDisable)',
       async ({ title, actions, shouldDisable }) => {