develop-when running coverage html - the 'null code coverage' is shown as title

[jgebal]

When running ut_html_coverage_reporter from SQL Developer - I get:
<title>Code coverage</title>
When running from cli I get:
<title>null code coverage</title>
It seems that you're calling constructor with 'null' as a string:
ut_coverage_html_reporter('null')
Rather than calling it with an actual null:
ut_coverage_html_reporter(null)