fix cmake error #374
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fix cmake error #374
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Signed-off-by: Christopher Decker <chris.decker08@gmail.com>
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I'm not sure if its fixed in newer cmakes, but on my version (3.21.3)
if(TARGET ${EMPTY_VARIABLE})evaluates to true and causes syntax errors. Checking if the variable is empty before evaluatign if its a valid target mitigates this.