Description of problem:
Using meld, can't remember exact action.

Version-Release number of selected component:
meld-3.13.1-1.fc22

Additional info:
reporter:       libreport-2.5.1
cmdline:        /usr/bin/python /usr/bin/meld ovirt-live-artwork.spec ovirt-live-artwork.spec.in
executable:     /usr/bin/meld
kernel:         4.0.4-303.fc22.x86_64
runlevel:       N 5
type:           Python
uid:            20528

Truncated backtrace:
filediff.py:1453:<genexpr>:KeyError: None

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/meld/filediff.py", line 1453, in on_diffs_changed
    nl_string = ", ".join(NEWLINES[n] for n in nl_types)
  File "/usr/lib/python2.7/site-packages/meld/filediff.py", line 1453, in <genexpr>
    nl_string = ", ".join(NEWLINES[n] for n in nl_types)
KeyError: None

Local variables in innermost frame:
.0: <tupleiterator object at 0x7f24fc58b050>
n: None