Fix zodb analyze with empty reports (!9) · Merge requests · nexedi / zodbtools

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Fix zodb analyze with empty reports

Fix for this kind of errors:

(env)$ zodb analyze demo.fs ffffffffffffffff..
# ø
Processed 0 records in 0 transactions
Traceback (most recent call last):
  File "/srv/slapgrid/slappart8/srv/runner/project/zodbtools/env/bin/zodb", line 11, in <module>
    load_entry_point('zodbtools', 'console_scripts', 'zodb')()
  File "/srv/slapgrid/slappart8/srv/runner/project/zodbtools/zodbtools/zodb.py", line 130, in main
    return command_module.main(argv)
  File "/srv/slapgrid/slappart8/srv/runner/project/zodbtools/zodbtools/zodbanalyze.py", line 305, in main
    report(analyze(path, use_dbm, delta_fs, tidmin, tidmax), csv)
  File "/srv/slapgrid/slappart8/srv/runner/project/zodbtools/zodbtools/zodbanalyze.py", line 102, in report
    print "Average record size is %7.2f bytes" % (rep.DBYTES * 1.0 / rep.OIDS)
ZeroDivisionError: float division by zero

and also small fixes for python3 compatibility