utils.py: get_b32(): handle bad base64 hashes

pyi2phosts/lib/utils.py

@@ -56,7 +56,11 @@ def validate_config(config):
 
 def get_b32(dest):
 	""" Calculate base32 hash from base64 """
+	try:
 		raw_key = base64.b64decode(dest.encode('utf-8'), '-~')
+	except TypeError:
+		return 'corrupted_base64_hash'
+	else:
 		hash = hashlib.sha256(raw_key)
 		b32 = base64.b32encode(hash.digest()).lower().replace('=', '')+'.b32.i2p'
 		return b32