Make hasEntity() work with a closed stream.

Author: Dan Downs

core-common/src/main/java/org/glassfish/jersey/message/internal/InboundMessageContext.java

@@ -741,8 +741,6 @@ public void setWorkers(MessageBodyWorkers workers) {
      *         {@code false} otherwise.
      */
     public boolean hasEntity() {
-        entityContent.ensureNotClosed();
-
         try {
             return !entityContent.isEmpty();
         } catch (IllegalStateException ex) {