OZG-6944 fix ITCase

vorgang-manager-server/src/test/java/de/ozgcloud/nachrichten/antragraum/AntragraumITCase.java

@@ -446,6 +446,8 @@ class AntragraumITCase {
 					.setFileId(fileId)
 					.build();
 
+			grpcService.getAttachmentContent(request, responseObserver);
+
 			verify(responseObserver, never()).setOnReadyHandler(any());
 
 		}
@@ -461,6 +463,8 @@ class AntragraumITCase {
 					.setFileId(fileId)
 					.build();
 
+			grpcService.getAttachmentContent(request, responseObserver);
+
 			verify(responseObserver, never()).setOnReadyHandler(any());
 		}
 
@@ -476,6 +480,8 @@ class AntragraumITCase {
 					.setFileId(fileId)
 					.build();
 
+			grpcService.getAttachmentContent(request, responseObserver);
+
 			verify(responseObserver, never()).setOnReadyHandler(any());
 		}
 
@@ -491,6 +497,8 @@ class AntragraumITCase {
 					.setFileId(fileId)
 					.build();
 
+			grpcService.getAttachmentContent(request, responseObserver);
+
 			verify(responseObserver, never()).setOnReadyHandler(any());
 		}
 	}