"There is a node without any running inputs" notification

Hello,

When a graylog-server doesn't have any input attached, such notification appears in red in overview panel without possibility to ignore it forever.

Since, graylog-web-interface/graylog-server merge, i don't think such information is relevant, as a natural setup will be to use graylog master as api/webinterface node role (no input) and let other graylog nodes do only processing (this mean web_enable = false).

So maybe, this notification should appears only if involved node is also doing **Message processing**, which means to keep this state also stateful.

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