pkpgcounter always tries to read from stdin when not launched from ttyjj

[lukas227]

The main function of pkpgpdls/analyzer.py will always append "-" to the list of arguments in case it not launched from a tty (and "-" is not already there).

When not launched from tty with a file given as argument, the file is correctly processed, but an error is produced on stderr:
Unsupported file format for /tmp/tmpXXXXXX (input file /tmp/tmpXXXXXX is empty !)

Patch is attached.