lang/perl5.24 upgrade breaks munin-graph in sysutils/munin-master

[Greg Rivers]

After upgrading to perl 5.24, munin-graph now exits thusly:

2016/11/06 16:40:42 [PERL WARNING] Use of uninitialized value $dom in concatenation (.) or string at /usr/local/share/munin/munin-graph line 131, <GEN1> line 1.
2016/11/06 16:40:42 [PERL WARNING] Use of uninitialized value $host in concatenation (.) or string at /usr/local/share/munin/munin-graph line 131, <GEN1> line 1.
2016/11/06 16:40:42 [PERL WARNING] Use of uninitialized value $serv in concatenation (.) or string at /usr/local/share/munin/munin-graph line 131, <GEN1> line 1.
2016/11/06 16:40:42 [PERL WARNING] Use of uninitialized value $scale in concatenation (.) or string at /usr/local/share/munin/munin-graph line 131, <GEN1> line 1.
2016/11/06 16:40:42 [PERL WARNING] Use of uninitialized value $scale in pattern match (m//) at /usr/local/share/munin/munin-graph line 133, <GEN1> line 1.
2016/11/06 16:40:42 [WARNING] Request for graph without specifying domain. Bailing out.
2016/11/06 16:40:42 Invalid parameters!

and no charts are produced.

-- 
Greg