Bugfix/interactive shell none delim (#92)

* Bugfix for when the caller passes None as the delimiter to InteractiveShellCommand

Author: greateggsgreg

adb/adb_protocol.py

@@ -451,7 +451,7 @@ def InteractiveShellCommand(cls, conn, cmd=None, strip_cmd=True, delim=None, str
           The stdout from the shell command.
         """
 
-        if not isinstance(delim, bytes):
+        if delim is not None and not isinstance(delim, bytes):
             delim = delim.encode('utf-8')
 
         # Delimiter may be shell@hammerhead:/ $