terminateOnAssertFailure - Does not terminate while cannot find element.

[gravity-api]

Describe the bug
Automation continues to run after assertion failure and when terminateOnAssertFailure = true

To Reproduce
Steps to reproduce the behavior:

1. Create automation request with 3 actions
2. Action NO.2 is assertion which is always false (i.e. fails)
3. Set terminateOnAssertFailure = true (under engine configuration)
4. Run automation

Expected behavior
Automation is terminated after the 2nd step (i.e. the 3rd step was not executed)

Additional context
Based on savanna-projects/rhino-agent#88