Check if get was successful before trying to set some config. #16
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In the set_motion_detection() function, the code is getting the current configuration, and then enabling/disabling the motion detection flag accordingly. The code is not checking if the get succeeded before trying to set the configuration.
Example, in a case where the foscam camera is not communicable, then if we try to give enable_motion_detection, then it will report an error that unable to set the "isEnable" flag etc.
This check fixes that error.