Check ratchet dir exists before cleaning

RNS/Identity.py

@@ -249,7 +249,7 @@ class Identity:
 
     @staticmethod
     def _remember_ratchet(destination_hash, ratchet):
-        # TODO: Remove at some point
+        # TODO: Remove at some point, and only log new ratchets
         RNS.log(f"Remembering ratchet {RNS.prettyhexrep(Identity.truncated_hash(ratchet))} for {RNS.prettyhexrep(destination_hash)}", RNS.LOG_EXTREME)
         try:
             Identity.known_ratchets[destination_hash] = ratchet
@@ -286,6 +286,7 @@ class Identity:
         try:
             now = time.time()
             ratchetdir = RNS.Reticulum.storagepath+"/ratchets"
+            if os.path.isdir(ratchetdir):
                 for filename in os.listdir(ratchetdir):
                     try:
                         expired = False