[sr-dev] [kamailio/kamailio] drouting: fix crush for empty username in ruri (#1625)

[Dmitri Savolainen]

 - uri like sip:@host crushed kamailio

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#### Type Of Change
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You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1625

-- Commit Summary --

  * drouting: fix crush for empty username in ruri

-- File Changes --

    M src/modules/drouting/prefix_tree.c (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1625.patch
https://github.com/kamailio/kamailio/pull/1625.diff

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