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java.lang.IllegalArgumentException: 'publisher' must not be null
	at org.springframework.util.Assert.notNull(Assert.java:172)
	at org.springframework.http.client.MultipartBodyBuilder.asyncPart(MultipartBodyBuilder.java:191)
	at org.springframework.http.client.MultipartBodyBuilder.part(MultipartBodyBuilder.java:132)
	at org.springframework.http.client.MultipartBodyBuilder.part(MultipartBodyBuilder.java:117)
	at com.convatec.cdrservice.goal.service.GoalService.storesImageFiles(GoalService.java:2312)
	at com.convatec.cdrservice.test.goal.GoalServiceTest.testStoresImageFiles(GoalServiceTest.java:1943)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)