wallet: guard against exception in process_blocks
If an exception occurs, the thread needs to be joined, or it will be deleted while still live, and terminate the process.
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@ -720,6 +720,8 @@ void wallet2::refresh(uint64_t start_height, uint64_t & blocks_fetched, bool& re
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catch (const std::exception&)
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{
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blocks_fetched += added_blocks;
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if (pull_thread.joinable())
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pull_thread.join();
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if(try_count < 3)
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{
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LOG_PRINT_L1("Another try pull_blocks (try_count=" << try_count << ")...");
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