ScreenshotIsDifferentException: The path should not include an empty segment

[DanielJette]

Describe the bug

Testify version 2.0.0

This issue relates to:

• [x] The Kotlin library
• [x] The Gradle plugin
• [ ] The IntelliJ Platform plugin
• [ ] The sample code
• [ ] The documentation

To Reproduce

When a test fails, the following output is shown:

There was 1 failure:
1) default(com.foo.about.AboutScreenshotTest)
dev.testify.core.exception.ScreenshotIsDifferentException: 

*  The captured screenshot is different from the baseline screenshot.
*  Run `./gradlew app::screenshotPull` to view the differences.
*  Run `./gradlew app::screenshotTest -PtestClass=com.foo.about.AboutScreenshotTest#default` to run this test again.

Running the command ./gradlew app::screenshotPull yields this error:

* What went wrong:
Cannot locate tasks that match 'app::screenshotTest'. The path should not include an empty segment (try 'app:screenshotTest' instead).

Expected behavior

The error message should only use a single : to delineate the module name