Wrong analysis status: "Not in compilation database" #168

If there is no report in the current file, but it is possible to analyze it, the plugin wrongly shows: " Not in compilation datbase".

Reproduction:

1. take c source file with at least one report in it.
2. fix that report
3. The wrong status is shown.

CodeChecker version: 6.29.0
Plugin version: 1.7.0