Issue with submit.cgi while saving annotation.

```
AH01215: Died at /var/www/html/LabelMeAnnotationTool/annotationTools/perl/submit.cgi line 104.
End of script output before headers: submit.cgi.
```

**OS**: Red Hat Enterprise Linux Server 7.5 (Maipo)
**Server**: HTTPD

Start by inspecting annotationTools/perl/submit.cgi around line 104 and reproduce the annotation-save request under HTTPD on the reported Red Hat Enterprise Linux environment. Trace the failure behind the CGI error and verify that saving an annotation completes without the “End of script output before headers” message.

索引モデルが issue の本文から書いたものです。