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You need to clone rosbridge repo into your workspace.

Then, modified the rosapi_node. In specific this section:

def get_action_servers(request):
    """ Called by the rosapi/GetActionServers service. Returns a list of action servers based on actions standard topics """
    topics = proxy.get_topics(rosapi.glob_helper.topics_glob)
    action_servers = proxy.filter_action_servers(topics)
return GetActionServersResponse(action_servers)

change it to:

def get_action_servers(request):
    """ Called by the rosapi/GetActionServers service. Returns a list of action servers based on actions standard topics """
    topics = proxy.get_topics_and_tyes(rosapi.glob_helper.topics_glob)
    """ action_servers = proxy.filter_action_servers(topics) """
return ""

Are you using Image_Viewer as well? There is another bug/issue with rosweb/ROS Melodic.