[bisq-network/bisq] Asymmetrical alerts and support ticket messages when mediator is offline during dispute creation (#3730)

[Julian Knutsen]

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### Description

When the mediator node is down, Bob (the party that did not request mediation) receives a notification that mediation was started, but no ticket is available in his UI.

#### Version

c2e8806d1

### Steps to reproduce

1. Start a localnet cluster
2. Add mediator/refundagent
3. Take down mediator node
4. Start dispute from Alice
5. See that only Alice has ticket information for dispute
6. Restart Bob
7. See that Bob receives a notification that a dispute was started, but he is unable to see any information about the dispute through his Support tab

### Expected behaviour

Either:

1) Bob receives no information about the dispute until the mediator restarts

OR 

2) Bob receives all information about the dispute even with the mediator offline

### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->

### Screenshots

Before Bob Restart
![mediator_down_bob_doesnt_see_ticket](https://user-images.githubusercontent.com/8082291/70013189-ba347b00-152b-11ea-91bb-9461d609cd4c.JPG)

After Bob restart
![mediator_down_bob_sees_alert_but_no_ticket1](https://user-images.githubusercontent.com/8082291/70013194-bef92f00-152b-11ea-80b7-35c0f97f643e.JPG)
![mediator_down_bob_sees_alert_but_no_ticket2](https://user-images.githubusercontent.com/8082291/70013195-bef92f00-152b-11ea-8c59-9280befa7d5c.JPG)

#### Device or machine

Ubuntu 19.10


#### Additional info

<!-- Additional information useful for debugging (e.g. logs) -->


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