Fix empty message with empty SARIF path

extensions/ql-vscode/src/common/sarif-utils.ts

@@ -1,6 +1,7 @@
 import * as Sarif from "sarif";
 import type { HighlightedRegion } from "../variant-analysis/shared/analysis-result";
 import { ResolvableLocationValue } from "../common/bqrs-cli-types";
+import { isEmptyPath } from "./bqrs-utils";
 
 export interface SarifLink {
   dest: number;
@@ -111,6 +112,9 @@ export function parseSarifLocation(
     return { hint: "no artifact location" };
   if (physicalLocation.artifactLocation.uri === undefined)
     return { hint: "artifact location has no uri" };
+  if (isEmptyPath(physicalLocation.artifactLocation.uri)) {
+    return { hint: "artifact location has empty uri" };
+  }
 
   // This is not necessarily really an absolute uri; it could either be a
   // file uri or a relative uri.

extensions/ql-vscode/src/stories/results/AlertTable.stories.tsx

@@ -389,6 +389,22 @@ WithCodeFlows.args = {
                               message: { text: "id : String" },
                             },
                           },
+                          {
+                            location: {
+                              physicalLocation: {
+                                artifactLocation: {
+                                  uri: "file:/",
+                                  index: 5,
+                                },
+                                region: {
+                                  startLine: 13,
+                                  startColumn: 25,
+                                  endColumn: 54,
+                                },
+                              },
+                              message: { text: "id : String" },
+                            },
+                          },
                           {
                             location: {
                               physicalLocation: {

extensions/ql-vscode/test/unit-tests/common/sarif-utils.test.ts

@@ -76,6 +76,36 @@ describe("parsing sarif", () => {
       ).toEqual({
         hint: "artifact location has no uri",
       });
+      expect(
+        parseSarifLocation(
+          {
+            physicalLocation: {
+              artifactLocation: {
+                uri: "",
+                index: 5,
+              },
+            },
+          },
+          "",
+        ),
+      ).toEqual({
+        hint: "artifact location has empty uri",
+      });
+      expect(
+        parseSarifLocation(
+          {
+            physicalLocation: {
+              artifactLocation: {
+                uri: "file:/",
+                index: 5,
+              },
+            },
+          },
+          "",
+        ),
+      ).toEqual({
+        hint: "artifact location has empty uri",
+      });
     });
 
     it("should parse a sarif location with no region and no file protocol", () => {