James Mills  committed 0e56a42

- circuits.web: Raise a ``RuntimeError`` exception if when trying to create
an instance of the ``JSONRPC`` dispatcher we have no "json" support.

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File circuits/web/dispatchers/

     def __init__(self, path=None, target="*", encoding="utf-8"):
         super(JSONRPC, self).__init__()
+        if json is None:
+            raise RuntimeError("No json support available")
         self.path = path = target
         self.encoding = encoding