Crash on a particular user agent "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0"

[ReuvenSwirsky]

Crash:

uaparser:parse(<<"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0">>).                                                                                            
** exception error: bad argument
     in function  list_to_integer/1
        called as list_to_integer([])
     in call from uaparser_utils:bin_to_num/1 (src/uaparser_utils.erl, line 69)
     in call from uaparser_os:'-get_version_details/1-lc$^0/1-0-'/1 (src/uaparser_os.erl, line 37)
     in call from uaparser_os:'-get_version_details/1-lc$^0/1-0-'/1 (src/uaparser_os.erl, line 37)
     in call from uaparser_os:get_version/2 (src/uaparser_os.erl, line 30)
     in call from uaparser_os:make_proplist/2 (src/uaparser_os.erl, line 14)
     in call from uaparser:parse/1 (src/uaparser.erl, line 12)
(sideband@localhost)5> 
(sideband@localhost)5> uaparser:parse("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0").    ** exception error: bad argument                                                            
     in function  list_to_integer/1
        called as list_to_integer([])
     in call from uaparser_utils:bin_to_num/1 (src/uaparser_utils.erl, line 69)
     in call from uaparser_os:'-get_version_details/1-lc$^0/1-0-'/1 (src/uaparser_os.erl, line 37)
     in call from uaparser_os:'-get_version_details/1-lc$^0/1-0-'/1 (src/uaparser_os.erl, line 37)
     in call from uaparser_os:get_version/2 (src/uaparser_os.erl, line 30)
     in call from uaparser_os:make_proplist/2 (src/uaparser_os.erl, line 14)
     in call from uaparser:parse/1 (src/uaparser.erl, line 12)

The example on the readme.md works!

 uaparser:parse("Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/5.0; SLCC1; .NET CLR 2.0.50727; InfoPath.1; .NET CLR 3.5.30729; WinTSI 08.02.2010; .NET CLR 3.0.30729; .NET4.0C; BRI/1)").
[{browser,[{name,<<"internet explorer 7">>},
           {family,ie},
           {manufacturer,microsoft},
           {type,web_browser},
           {renderer,trident},
           {version,<<"7.0">>},
           {version_details,[{major,7},{minor,0}]}]},
 {os,[{name,<<"windows vista">>},
      {family,windows},
      {manufacturer,microsoft},
      {type,computer},
      {version,<<"6.0">>},
      {version_details,[{major,6},{minor,0}]}]}]