PIM null-register according to rfc4601 is incorrectly parsed
**This issue was migrated from [bug 11354](https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=11354) in our old bug tracker.** Original bug information: **Reporter:** koe…@‍one…\ **Status:** RESOLVED FIXED\ **Product:** Wireshark\ **Component:** Dissection engine (libwireshark)\ **OS:** All\ **Platform:** All\ **Version:** 1.12.3 Attachments: [PIMregister.pcap](/uploads/6c7ccfc7eee44094222d2b2c7101c5f0/PIMregister.pcap): sample null-register
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