fixes exeception for canceled scan task #5093
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An exception was happening when a scan task was canceled before it ever ran. This was caused by transitionFromRunning() executing when transitoinToRunning() had never executed. When this happened a precondition check that the scanThread was non-null would fail. These changes only execute transitionFromRunning() when transitionToRunning() has executed.
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An exception was happening when a scan task was canceled before it ever ran. This was caused by transitionFromRunning() executing when transitoinToRunning() had never executed. When this happened a precondition check that the scanThread was non-null would fail. These changes only execute transitionFromRunning() when transitionToRunning() has executed.