Fix unstable test MarkersRemoverValidatorIT.checkMarkers

Error Message

Expected size:<2> but was:<0> in:
<[]>

Stacktrace

java.lang.AssertionError: 
Expected size:<2> but was:<0> in:
<[]>
	at org.fusesource.ide.camel.validator.marker.MarkersRemoverValidatorIT.checkMarkers(MarkersRemoverValidatorIT.java:90)

Standard Error

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.