mukyz

Subfield not unset if only non bitmap field is removed

1

https://github.com/jpos/jPOS/blob/a2d7eaed46e500adbd443e16ed7805147e2a10d4/jpos/src/main/java/org/jpos/iso/ISOMsg.java#L404 ```!m.hasFields()``` returns false even if all fields are removed and the only one left is an empty bitmap field