Fix dotnetspy panic on premature exit and add tests. #203
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There is a case when
dotnetspy
couldn't establish a connection to Diagnostics Server before the next snapshot/stop call (e.g, target process exited, or the socket file cannot be found, etc).This fix adds a check whether the session has been actually created before accessing it. Given that there are no race conditions between reset/stop/snapshot calls, redundant mutexes were removed.