Not able to test datasource connection in Domain mode after applying CP 09 in EAP 7.4.

Issue

After applying CP 09 on EAP 7.4 I am not able to test the datasource connection in Domain mode through the browser (hal).

If I access the datasource subsystem on the server, I get an internal error message and no log in server.log or host-controller.log.

Runtime > Host > Server > Datasources

In the browser console I see the following error:

18:37:36.005 ERROR o.j.h.core.ExceptionHandler Uncaught exception: null
fel @ hal-0.js:10830

hal-0.js:10830 18:37:36.005 ERROR o.j.h.c.skeleton.HeaderView Internal error
fel @ hal-0.js:10830

hal-0.js:10805 Uncaught Error: java.lang.IllegalArgumentException
at uZd.el [as We] (hal-0.js:10805:770)
at uZd.nl [as cf] (hal-0.js:10805:1391)
at uZd.Yk (hal-0.js:8639:59)
at uZd.zl (hal-0.js:6387:23)
at uZd.Gl (hal-0.js:6388:23)
at new uZd (hal-0.js:6660:25)
at cjp.Hcp [as wyd] (hal-0.js:10846:5586)
at ZTf.jUf [as asBoolean] (hal-0.js:10822:17494)
at E8n.M8n [as Wgd] (hal-110.js:83:14375)
at _nm.aom [as i1] (hal-110.js:83:4982)
at new Eno (hal-0.js:10689:103)
at knm.rEf [as Q7] (hal-0.js:10822:3681)
at bko.eko [as Lkb] (hal-0.js:10840:13423)
at bko.dko [as Al] (hal-0.js:10840:13326)
at knm.tnm [as NOc] (hal-110.js:83:1730)
at Jom.Kom [as Vh] (hal-110.js:83:8014)
at gmp.Mmp [as MAd] (hal-0.js:10847:4605)
at qop.rop [as Vh] (hal-0.js:10847:11391)
at ynp.Bnp [as ZAd] (hal-0.js:10847:9578)
at ynp.Anp [as Al] (hal-0.js:10847:9445)
at mAq.pAq [as Al] (hal-0.js:10856:27362)
at inp.jnp [as Vh] (hal-0.js:10847:8931)
at gmp.Imp [as JAd] (hal-0.js:10847:4388)
at dop.eop [as aBd] (hal-0.js:10847:10807)
at Jmp (hal-0.js:5310:29)
at Function.hop (hal-0.js:10847:10991)
at XMLHttpRequest.d (hal-0.js:9629:47)

There are enabled datasources and disabled datasources.