Properly check if the timeout_handler has been set, do not segfault.
Properly check if the timeout_handler has been set, do not segfault.

hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,Vocalocity/rtpproxy-pre,jevonearth/rtpproxy,synety-jdebp/rtpproxy,Vocalocity/rtpproxy-pre,jevonearth/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy,mab-netdev/rtpproxy,jevonearth/rtpproxy,hongbinz/rtpproxy,DrumTechnologiesLtd/rtpproxy,hongbinz/rtpproxy,Vocalocity/rtpproxy-pre,hongbinz/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,synety-jdebp/rtpproxy,mab-netdev/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,DrumTechnologiesLtd/rtpproxy,DrumTechnologiesLtd/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,mab-netdev/rtpproxy