Better errors on unexpected bencode data

Also fix indent.

python/nrepl_fireplace.py

@@ -49,13 +49,17 @@ def bdecode(f, char=None):
       if char == 'e':
         return i
       i = 10 * i + int(char)
-    else:
+  elif char.isdigit():
     i = int(char)
     while True:
       char = f.read(1)
       if char == ':':
         return f.read(i)
       i = 10 * i + int(char)
+  elif char == '':
+    raise EOFError("unexpected end of bencode data")
+  else:
+    raise TypeError("unexpected type "+char+"in bencode data")
 
 
 class Connection: