Fix several crashes reported through Google Analytics #1073
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Fix the following crashes:
NullPointerException (@FlightActivity$3:onClick:98) {main}
NullPointerException (@FlightActivity$5:onClick:114) {main}
NullPointerException (@BluetoothConnection:findSerialBluetoothBoard:91) {MavLinkConnection-Connecting Thread}
NullPointerException (@FlightActivity$4:onLongClick:105) {main}
ClassCastException (@SuperSetupMainPanel:onCalibrationData:93) {main}
Also fixes issue #1022.