Prevent ddrescue-tui crash when LogDir is missing

* Fixes issue #115

.bin/Scripts/functions/ddrescue.py

@@ -278,6 +278,7 @@ class RecoveryState():
       raise GenericError('Unsupported mode')
     self.get_smart_source()
     self.set_working_dir()
+    os.makedirs(global_vars['LogDir'], exist_ok=True)
 
   def add_block_pair(self, source, dest):
     """Run safety checks and append new BlockPair to internal list."""