an empty matrix parameter is kept in a request

Hi,

we observed a strange behaviour in the soapUI versions 4.0.1 and 4.5, but not in the elder version 3.6.1:

If the matrix parameter "filter" is set to "abs123", we will get
"GET http://mucsgdp02:40180/mce/R12-4-0/publ ... ter=abc123 HTTP/1.1"
what is fine.

If the matrix parameter "filter" is left empty, we will get
"GET http://mucsgdp02:40180/mce/R12-4-0/publ ... 111;filter HTTP/1.1"
which means, the string "filter" is kept in this GET request, although it is empty.
This will cause trouble when sending the request.

This does not occur with version 3.6.1, but with 4.0.1 and 4.5.

Kind regards
Georg