fixed: error "Error detected while processing function <SNR><N>_detect" #10
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Some files can be unreadable by a current user when traversing up
through "neighbor"-files. If so, the following error occurs:
Error detected while processing function _detect:
line 12:
E484: Can't open file <unreadable_filename>
To avoid this error, let's be sure we can read that file before we try
to read it.