Add null check for getgrgid() in eigerDetector::writeOctet, fixes #85

[nmarks99]

This fixes #85. Perhaps a similar check should also be done for getpwuid as well?

ADEiger/eigerApp/src/eigerDetector.cpp

Line 708 in 7f52423

mFileOwner->put(getpwuid(mFsUid)->pw_name);

[MarkRivers]

The logic here looks fine but there appears to be whitespace issue. Did you use tab characters? Line 731 is not indented and lines 733 and 734 appear to have too much indent.

[nmarks99]

Ah yes sorry about that, it was using tab characters. I think it is fixed now