ensure that OT does not crash when thread message info points to NULL (#660)
ensure that OT does not crash when thread message info points to NULL (#660)


vaas-krish/openthread,lanyuwen/openthread,xiaom-GitHub/openthread,chshu/openthread,abtink/openthread,openthread/openthread,JakubBrachTieto/openthread,georgecpr/openthread,nibanks/openthread,mszczodrak/openthread,erja-gp/openthread,LeZhang2016/openthread,turon/openthread,bukepo/openthread,mszczodrak/openthread,librasungirl/openthread,erja-gp/openthread,bukepo/openthread,Zolertia/openthread,chshu/openthread,aeliot/openthread,fbsder/openthread,vaas-krish/openthread,georgecpr/openthread,turon/openthread,jjlee3/openthread,jjlee9/openthread,fbsder/openthread,gandreello/openthread,JakubBrachTieto/openthread,GiedriusM/openthread,nibanks/openthread,LeZhang2016/openthread,openthread/openthread,GiedriusM/openthread,fbsder/openthread,jjlee3/openthread,vaas-krish/openthread,jjlee3/openthread,xiaom-GitHub/openthread,erja-gp/openthread,lanyuwen/openthread,turon/openthread,chshu/openthread,bukepo/openthread,jwhui/openthread,lanyuwen/openthread,jwhui/openthread,aeliot/openthread,aeliot/openthread,chshu/openthread,jwhui/openthread,georgecpr/openthread,srickardti/openthread,nibanks/openthread,xiaom-GitHub/openthread,Zolertia/openthread,abtink/openthread,chshu/openthread,pvanhorn/openthread,GiedriusM/openthread,gandreello/openthread,jjlee9/openthread,openthread/openthread,xiaom-GitHub/openthread,jjlee3/openthread,openthread/openthread,Zolertia/openthread,GiedriusM/openthread,nibanks/openthread,jjlee9/openthread,jjlee9/openthread,bukepo/openthread,georgecpr/openthread,LeZhang2016/openthread,erja-gp/openthread,erja-gp/openthread,abtink/openthread,aeliot/openthread,fbsder/openthread,JakubBrachTieto/openthread,nibanks/openthread,pvanhorn/openthread,georgecpr/openthread,gandreello/openthread,LeZhang2016/openthread,jjlee9/openthread,erja-gp/openthread,LeZhang2016/openthread,jwhui/openthread,gandreello/openthread,vaas-krish/openthread,mszczodrak/openthread,chshu/openthread,JakubBrachTieto/openthread,lanyuwen/openthread,aeliot/openthread,srickardti/openthread,xiaom-GitHub/openthread,srickardti/openthread,pvanhorn/openthread,LeZhang2016/openthread,JakubBrachTieto/openthread,pvanhorn/openthread,pvanhorn/openthread,georgecpr/openthread,abtink/openthread,Zolertia/openthread,xiaom-GitHub/openthread,GiedriusM/openthread,turon/openthread,vaas-krish/openthread,Zolertia/openthread,JakubBrachTieto/openthread,fbsder/openthread,aeliot/openthread,jjlee3/openthread,lanyuwen/openthread,mszczodrak/openthread,lanyuwen/openthread,mszczodrak/openthread,vaas-krish/openthread,gandreello/openthread,fbsder/openthread,nibanks/openthread,librasungirl/openthread,pvanhorn/openthread,librasungirl/openthread,gandreello/openthread,jjlee9/openthread,srickardti/openthread,mszczodrak/openthread,librasungirl/openthread