Enhance a bit build_cache.py script

client/build_cache.py

@@ -4,7 +4,7 @@ import math
 import os
 import sqlite3
 
-logging.basicConfig(level=logging.INFO)
+logging.basicConfig(level=logging.DEBUG)
 
 if "XDG_DATA_HOME" in os.environ:
     _MPDBLISS_DATA_HOME = os.path.expandvars("$XDG_DATA_HOME/mpdbliss")
@@ -70,4 +70,7 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    try:
+        main()
+    except KeyboardInterrupt:
+        pass