Fix crash if server does not provide DiscoveryUrls #1388
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The OPC UA specification does not forbid that a server does not offer DiscoveryUrls. This can lead to a crash when calling the function application_to_strings(). Check DiscoveryUrls for None or empty before iterating to avoid the crash described in #1127.
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The OPC UA specification does not forbid that a server does not offer DiscoveryUrls. This can lead to a crash when calling the function application_to_strings().
Check DiscoveryUrls for None or empty before iterating to avoid the crash described in #1127.