preventing crashing when calling TSSslContextFindByName with a nullptr or a 0 lenght string
preventing crashing when calling TSSslContextFindByName with a nullptr or a 0 lenght string

bryancall/trafficserver,pbchou/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,dyrock/trafficserver,pbchou/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,duke8253/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,duke8253/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,dyrock/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,davidbz/trafficserver,dyrock/trafficserver,davidbz/trafficserver,dyrock/trafficserver,davidbz/trafficserver,bryancall/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,duke8253/trafficserver