Fix empty prompt logs

[RomneyDa]

Description

Didn't have any contentToShow in case where message content was already a string.

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[tomasz-stefaniak]

Test? 🙏

[Patrick-Erichsen]

Actually +1 to Tomasz here, think it would be nice to get our first e2e test for prompt logs

[RomneyDa]

time boxed my test writing and didn't quite get selecting terminal output to work. Posting here for future reference

  it.only("Shows in prompt logs", async () => {
      const [messageInput] = await GUISelectors.getMessageInputFields(view);
      const messagePair = TestUtils.generateTestMessagePair();
      await messageInput.sendKeys(messagePair.userMessage);
      await messageInput.sendKeys(Key.ENTER);
      await TestUtils.waitForSuccess(() =>
        GUISelectors.getThreadMessageByText(view, messagePair.llmResponse),
      );
      view.switchBack();
      const output = await GUISelectors.getContinueOutputLog(driver);
      expect(await output.getText()).has.string(messagePair.userMessage);
    });

  public static async getContinueOutputLog(driver: WebDriver) {
    await new Workbench().executeCommand("Focus on Output View");
    // const option = await driver.findElement(By.xpath("//option[contains(text(), 'Continue - LLM Prompt/Completion')]"));
    const select = await driver.findElements(By.xpath("//select"));
    select[1].click();
    const option = await driver.findElement(
      By.xpath(
        "//option[contains(text(), 'Continue - LLM Prompt/Completion')]",
      ),
    );
    option.click();
    await new Promise((resolve) => setTimeout(resolve, 10000));
    const output = await driver.findElement(
      By.xpath(
        "//*[@data-uri^='output:extension-output-Continue.continue-%231-Continue%20-%20LLM%20Prompt/Completion']",
      ),
    );
    return output;
  }