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error using `git mergetool --tool=meld`

When using `git mergetool --tool=kdiff3`, it works fine. But with `git mergetool --tool=meld` I get this for every merge conflict:

Normal merge conflict for 'builders/pdfBuilder.py':
  {local}: created file
  {remote}: created file
Traceback (most recent call last):
  File "/usr/local/bin/meld", line 20, in <module>
    filename = arg.split('=')[1]
IndexError: list index out of range
builders/pdfBuilder.py seems unchanged.

And the contents of /usr/local/bin/meld are:

arglist = []
for arg in sys.argv[1:]:
    if arg.startswith('--output'):
        filename = arg.split('=')[1] ##### <<--------- line 20
        newArg = '--output=' + fix_abspath(filename)
    elif arg.startswith('-'):
        newArg = arg
        newArg = fix_abspath(arg)

I'm on OSX: 10.12.4

git --version
git version 2.12.2

This is my first post to the mailing list, sorry if the bug report is missing anything.