Fix random in EmptyDocumentTest.testEmptyDocumentEnrichers

Run unit tests / Run mongodb unit tests / org.nuxeo.ecm.restapi.test.EmptyDocumentTest.testEmptyDocumentEnrichers
Failing for the past 1 build (Since #10 )
Took 1.6 sec.
Error Message

expected:<0> but was:<1>

Stacktrace

java.lang.AssertionError: expected:<0> but was:<1>
	at org.junit.Assert.fail(Assert.java:89)
	at org.junit.Assert.failNotEquals(Assert.java:835)
	at org.junit.Assert.assertEquals(Assert.java:647)
	at org.junit.Assert.assertEquals(Assert.java:633)
	at org.nuxeo.ecm.restapi.test.EmptyDocumentTest.testEmptyDocumentEnrichers(EmptyDocumentTest.java:100)
...
2022-04-19 14:21:36,546 [stream/introspectionPool-00,in:0,inCheckpoint:0,out:0,lastRead:1650378096546,lastTimer:0,wm:0,loop:2,rebalance assigned] WARN  [StreamIntrospectionComputation] Instance elected to introspect Nuxeo Stream activity