docs(stack-trace): Add story for frames with no filename

Author: scttcper

static/app/components/stackTrace/stackTrace.stories.tsx

@@ -1002,6 +1002,41 @@ export default Storybook.story('StackTrace', story => {
     );
   });
 
+  story('StackTraceProvider - No Filename', () => {
+    const event = makeEvent({platform: 'javascript', projectID: '1'});
+    const stacktrace: StacktraceWithFrames = {
+      framesOmitted: null,
+      hasSystemFrames: false,
+      registers: {},
+      frames: [
+        makeFrame({
+          filename: null,
+          module: null,
+          absPath: null,
+          function: 'eval',
+          lineNo: 5,
+          colNo: 20,
+          inApp: true,
+        }),
+      ],
+    };
+
+    return (
+      <Fragment>
+        <p>
+          Frames with no filename or module (e.g. browser <code>eval</code>) show a muted{' '}
+          <code>{'<unknown>'}</code> in the path slot.
+        </p>
+        <StoryStackTraceProvider event={event} stacktrace={stacktrace}>
+          <StackTraceFrames
+            frameContextComponent={FrameContent}
+            frameActionsComponent={StoryFrameActions}
+          />
+        </StoryStackTraceProvider>
+      </Fragment>
+    );
+  });
+
   story('StackTraceProvider - Raw Function and Package', () => {
     const {event, stacktrace} = makeRawFunctionAndPackageStackTraceData();