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Added fix for USB init error on machines without USB port #41
Fix for issue #40
Ark-client tries to initialize a USB port to check if a Ledger is connected, when no USB port can be initialized the app crashes.
I have added error handling for the loading of the modules that manage the Ledger. This prevents a crash when no USB port exists on the system. The user is warned when no support for the Ledger is available and all methods that might use the Ledger have an addtional check if Ledger support is enabled or not.