[Android] Fix that trying to remote debug will cause crash
[Android] Fix that trying to remote debug will cause crash

It's caused by missing a null pointer checker.

BUG=https://crosswalk-project.org/jira/browse/XWALK-2936

ZhengXinCN/crosswalk,zliang7/crosswalk,mrunalk/crosswalk,myroot/crosswalk,ZhengXinCN/crosswalk,zeropool/crosswalk,axinging/crosswalk,leonhsl/crosswalk,heke123/crosswalk,dreamsxin/crosswalk,DonnaWuDongxia/crosswalk,baleboy/crosswalk,lincsoon/crosswalk,marcuspridham/crosswalk,ZhengXinCN/crosswalk,jpike88/crosswalk,jpike88/crosswalk,Bysmyyr/crosswalk,tedshroyer/crosswalk,tomatell/crosswalk,amaniak/crosswalk,tomatell/crosswalk,zeropool/crosswalk,minggangw/crosswalk,Pluto-tv/crosswalk,xzhan96/crosswalk,baleboy/crosswalk,PeterWangIntel/crosswalk,zliang7/crosswalk,jondwillis/crosswalk,tedshroyer/crosswalk,marcuspridham/crosswalk,darktears/crosswalk,crosswalk-project/crosswalk-efl,crosswalk-project/crosswalk-efl,XiaosongWei/crosswalk,baleboy/crosswalk,jondwillis/crosswalk,zeropool/crosswalk,DonnaWuDongxia/crosswalk,siovene/crosswalk,baleboy/crosswalk,hgl888/crosswalk-efl,darktears/crosswalk,pk-sam/crosswalk,bestwpw/crosswalk,chinakids/crosswalk,bestwpw/crosswalk,Bysmyyr/crosswalk,RafuCater/crosswalk,heke123/crosswalk,jondong/crosswalk,rakuco/crosswalk,ZhengXinCN/crosswalk,rakuco/crosswalk,tomatell/crosswalk,hgl888/crosswalk,stonegithubs/crosswalk,baleboy/crosswalk,darktears/crosswalk,rakuco/crosswalk,hgl888/crosswalk-efl,Bysmyyr/crosswalk,chuan9/crosswalk,heke123/crosswalk,ZhengXinCN/crosswalk,heke123/crosswalk,xzhan96/crosswalk,siovene/crosswalk,tedshroyer/crosswalk,crosswalk-project/crosswalk,lincsoon/crosswalk,alex-zhang/crosswalk,lincsoon/crosswalk,jpike88/crosswalk,axinging/crosswalk,weiyirong/crosswalk-1,minggangw/crosswalk,alex-zhang/crosswalk,xzhan96/crosswalk,PeterWangIntel/crosswalk,minggangw/crosswalk,jondwillis/crosswalk,myroot/crosswalk,crosswalk-project/crosswalk,xzhan96/crosswalk,zeropool/crosswalk,mrunalk/crosswalk,hgl888/crosswalk-efl,ZhengXinCN/crosswalk,baleboy/crosswalk,zliang7/crosswalk,stonegithubs/crosswalk,lincsoon/crosswalk,axinging/crosswalk,lincsoon/crosswalk,XiaosongWei/crosswalk,tedshroyer/crosswalk,jondong/crosswalk,hgl888/crosswalk,bestwpw/crosswalk,hgl888/crosswalk-efl,Bysmyyr/crosswalk,crosswalk-project/crosswalk,stonegithubs/crosswalk,Bysmyyr/crosswalk,pk-sam/crosswalk,bestwpw/crosswalk,dreamsxin/crosswalk,pk-sam/crosswalk,rakuco/crosswalk,alex-zhang/crosswalk,chinakids/crosswalk,zeropool/crosswalk,RafuCater/crosswalk,chinakids/crosswalk,alex-zhang/crosswalk,zeropool/crosswalk,axinging/crosswalk,PeterWangIntel/crosswalk,marcuspridham/crosswalk,tomatell/crosswalk,hgl888/crosswalk-efl,chinakids/crosswalk,RafuCater/crosswalk,ZhengXinCN/crosswalk,DonnaWuDongxia/crosswalk,amaniak/crosswalk,alex-zhang/crosswalk,darktears/crosswalk,chuan9/crosswalk,jondong/crosswalk,hgl888/crosswalk-efl,XiaosongWei/crosswalk,weiyirong/crosswalk-1,alex-zhang/crosswalk,leonhsl/crosswalk,zliang7/crosswalk,rakuco/crosswalk,leonhsl/crosswalk,Pluto-tv/crosswalk,Pluto-tv/crosswalk,lincsoon/crosswalk,Pluto-tv/crosswalk,jondong/crosswalk,jondong/crosswalk,PeterWangIntel/crosswalk,lincsoon/crosswalk,chinakids/crosswalk,chinakids/crosswalk,DonnaWuDongxia/crosswalk,siovene/crosswalk,axinging/crosswalk,jondong/crosswalk,tedshroyer/crosswalk,stonegithubs/crosswalk,crosswalk-project/crosswalk-efl,tomatell/crosswalk,chuan9/crosswalk,crosswalk-project/crosswalk-efl,hgl888/crosswalk,darktears/crosswalk,hgl888/crosswalk,jondwillis/crosswalk,darktears/crosswalk,marcuspridham/crosswalk,RafuCater/crosswalk,tedshroyer/crosswalk,baleboy/crosswalk,leonhsl/crosswalk,weiyirong/crosswalk-1,crosswalk-project/crosswalk-efl,marcuspridham/crosswalk,darktears/crosswalk,mrunalk/crosswalk,hgl888/crosswalk,mrunalk/crosswalk,crosswalk-project/crosswalk,chuan9/crosswalk,chuan9/crosswalk,bestwpw/crosswalk,darktears/crosswalk,jpike88/crosswalk,axinging/crosswalk,Bysmyyr/crosswalk,crosswalk-project/crosswalk-efl,crosswalk-project/crosswalk,amaniak/crosswalk,axinging/crosswalk,minggangw/crosswalk,myroot/crosswalk,pk-sam/crosswalk,jondwillis/crosswalk,pk-sam/crosswalk,stonegithubs/crosswalk,amaniak/crosswalk,siovene/crosswalk,bestwpw/crosswalk,tedshroyer/crosswalk,minggangw/crosswalk,weiyirong/crosswalk-1,jondwillis/crosswalk,leonhsl/crosswalk,zliang7/crosswalk,bestwpw/crosswalk,zliang7/crosswalk,jondong/crosswalk,leonhsl/crosswalk,marcuspridham/crosswalk,tomatell/crosswalk,hgl888/crosswalk-efl,amaniak/crosswalk,myroot/crosswalk,chuan9/crosswalk,myroot/crosswalk,jpike88/crosswalk,DonnaWuDongxia/crosswalk,jpike88/crosswalk,amaniak/crosswalk,RafuCater/crosswalk,dreamsxin/crosswalk,stonegithubs/crosswalk,zliang7/crosswalk,stonegithubs/crosswalk,xzhan96/crosswalk,jondwillis/crosswalk,minggangw/crosswalk,siovene/crosswalk,zeropool/crosswalk,weiyirong/crosswalk-1,heke123/crosswalk,xzhan96/crosswalk,RafuCater/crosswalk,mrunalk/crosswalk,chuan9/crosswalk,Pluto-tv/crosswalk,heke123/crosswalk,weiyirong/crosswalk-1,dreamsxin/crosswalk,xzhan96/crosswalk,crosswalk-project/crosswalk-efl,heke123/crosswalk,heke123/crosswalk,XiaosongWei/crosswalk,crosswalk-project/crosswalk,jondong/crosswalk,XiaosongWei/crosswalk,dreamsxin/crosswalk,PeterWangIntel/crosswalk,hgl888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