autobug - don't fail if the gatt goes away while we are connecting

app/src/main/java/com/geeksville/mesh/service/BluetoothInterface.kt

@@ -285,12 +285,13 @@ class BluetoothInterface(val service: RadioInterfaceService, val address: String
      */
     private fun forceServiceRefresh() {
         exceptionReporter {
-            // BluetoothGatt gatt
-            val gatt = safe!!.gatt!!
+            // If the gatt has been destroyed, skip the refresh attempt
+            safe?.gatt?.let { gatt ->
                 val refresh: Method = gatt.javaClass.getMethod("refresh")
                 refresh.invoke(gatt)
             }
         }
+    }
 
     /// We only force service refresh the _first_ time we connect to the device.  Thereafter it is assumed the firmware didn't change
     private var hasForcedRefresh = false