Program a bit more defensively

Even though /setup/eureka_info should always be JSON...

Author: wvu

modules/auxiliary/scanner/chromecast/chromecast_webserver.rb

@@ -40,7 +40,12 @@ def run_host(ip)
 
     return unless (res && res.code == 200)
 
-    json = JSON.parse(res.body)
+    begin
+      json = JSON.parse(res.body)
+    rescue JSON::ParserError
+      return
+    end
+
     name, ssid = json['name'], json['ssid']
 
     if name && ssid