code: public boolean isLoadable() {
  		if (getPayload() instanceof NullPayload) {
  			return false;
  		}
  		
  		try {
  			InputStream is = getInputStream();
  			try {
  				is.read();
  				return true;
  			} finally {
  				is.close();
  			}
  		} catch (IOException ex) {
  			return false;
  		}
  	}
docs: Tests whether the Cargo's payload is loadable.
  
  @return returns true if cargo content is safe to load, false otherwise