Fix core too strongly bound to underlying nodes #460
Merged
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CT Core relies on nodes, more precisely on node's API's. In case a node get unreachable, a call to it's API will fail. This behaviour is expected, but needs some attention.
If a result of the API call is a dictionary, accessing the content of this dictionary needs to be done in a safe way.
This was done most of the time, but some remaining parts of the codes were still using API results without checking that the result is indeed available.
This PR fixes this issue (#459)