Harden intent handling for android
If during card communications on android, the contact to the card ist lost for a short period of time, android immediately sends a new intent. This can lead to exceptions within lib, since the "nfc stack ist not properrely initialized".
Within fifty-fifty apps this is avoided by switching the intent dispatch off in "onCardRecogniztion" callback.
However we should try to harden the library to not break if this happens.