Allow empty strings in workflow_dispatch choice options (#245)

Fixes vscode#395 - Empty value for choice option shows 'Unexpected value' error

Empty strings are valid options for workflow_dispatch inputs with type: choice.
They allow users to make a choice 'optional' or force explicit selection.

Changes:
- Add sequence-of-string type that allows empty strings (unlike sequence-of-non-empty-string)
- Use sequence-of-string for workflow_dispatch options field
- Add test to verify empty string in choice options doesn't produce validation errors

languageservice/src/validate.test.ts

@@ -385,4 +385,31 @@ jobs:
       expect(result).toEqual([]);
     });
   });
+
+  describe("workflow_dispatch", () => {
+    it("allows empty string in choice options", async () => {
+      const result = await validate(
+        createDocument(
+          "wf.yaml",
+          `on:
+  workflow_dispatch:
+    inputs:
+      plugin-name:
+        description: Specific plugin to build
+        type: choice
+        options:
+          - ''
+          - foo
+          - bar
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo`
+        )
+      );
+
+      expect(result).toEqual([]);
+    });
+  });
 });

workflow-parser/src/workflow-v1.0.json

@@ -1539,7 +1539,7 @@
           },
           "default": "workflow-dispatch-input-default",
           "options": {
-            "type": "sequence-of-non-empty-string",
+            "type": "sequence-of-string",
             "description": "The options of the dropdown list, if the type is a choice."
           }
         }
@@ -2419,6 +2419,11 @@
         "item-type": "non-empty-string"
       }
     },
+    "sequence-of-string": {
+      "sequence": {
+        "item-type": "string"
+      }
+    },
     "boolean-needs-context": {
       "context": [
         "github",