java.lang.IllegalArgumentException: The argument 'command' must not be null or empty.

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java.lang.IllegalArgumentException: The argument 'command' must not be null or empty.
at org.eclipse.smarthome.core.items.events.ItemEventFactory.assertValidArguments(ItemEventFactory.java:344)
at org.eclipse.smarthome.core.items.events.ItemEventFactory.createCommandEvent(ItemEventFactory.java:186)
at org.eclipse.smarthome.core.items.events.ItemEventFactory.createCommandEvent(ItemEventFactory.java:204)
at org.openhab.io.hueemulation.internal.HueEmulationServlet.apiState(HueEmulationServlet.java:269)
at org.openhab.io.hueemulation.internal.HueEmulationServlet.service(HueEmulationServlet.java:221)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
at java.lang.Thread.run(Thread.java:745)

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