Fix error caused by non-existent variable_frequency property #70
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This is in regards to https://forums.adafruit.com/viewtopic.php?p=958532.
This fixes an issue introduced by #67 because the
variable_frequency
is not a property of PWMOut according to https://docs.circuitpython.org/en/latest/shared-bindings/pwmio/index.html nor is it a property of the Seesaw PWMOut which is used on the Raspberry Pi. I'm not sure if it exists in certain instances, so I just added a check if it has the attribute before trying to use it.