some exception was happen when i delete graph schema before delete the data of graph. Details are as follow

Pino Chang <17600...@...>

First,i create a graph with one vertex label "person" and two properties "name" and "age",and i add some data to graph as follow:

tx.addVertex(T.label, "person", "name", "John", "age", 20)
tx.addVertex(T.label, "person", "name", "Nana", "age", 23)

Then,i delete the graph schema "person","name" and "age",but the data was not disappear.I tried to use "g.V().drop().iterate()" to delete the data,i got the follow exception 


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