Seahorse may segfault during key synchronization

While working on #9095 (closed) (amongst other tickets) I found that if there’s a communication failure with the keyserver during key synchronization, Seahorse may abort with a segfault. I have not yet seen this problem when fetching keys.

I don’t know if there’s an upstream bug for this.

Related issues

Related to #9791 (closed)
Related to #10500 (closed)
Related to #9095 (closed)

Original created by @kytv on 9970 (Redmine)

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