Avoid displaying empty vulnerabilities table in job output

Found project in /tmp/app
2018/05/11 21:23:49 [find-sec-bugs] Detect project using plugin
2018/05/11 21:23:49 [find-sec-bugs] Project not compatible
2018/05/11 21:23:49 [find-sec-bugs-gradle] Detect project using plugin
2018/05/11 21:23:49 [find-sec-bugs-gradle] Project not compatible
2018/05/11 21:23:49 [flawfinder] Detect project using plugin
2018/05/11 21:23:49 [flawfinder] Project not compatible
2018/05/11 21:23:49 [go-ast-scanner] Detect project using plugin
+----------------------------------------------------------------------------------------+
| Priority   | Tool       | Source                                                       |
+----------------------------------------------------------------------------------------+
2018/05/11 21:23:49 [go-ast-scanner] Project not compatible
Uploading artifacts...
gl-sast-report.json: found 1 matching files        
Uploading artifacts to coordinator... ok            id=67840610 responseStatus=201 Created token=o5DsujFL
Job succeeded