[Nepomuk] The "Stop Query" Button

[Who Knows]

 Hello, i have tried to add the feature where Stop Query button is only
effective when there is a query running though i couldn't test it out, but i
feel it should work, if it doesn't do tell me i will fix it.
  also my real name is 'Smit Shah'. (yeah i forgot to mention it in my last
post)
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