check if blurRadius is <= 0.0f in applyBlurOnImage #13
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can result in EXC_BAD_ACCESS during image convolution otherwise.
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If blurRadius comes into applyBlurOnImage as exactly 0.0f for whatever reason (including in my case, explictly setting it to that, vImageBoxConvolve_ARGB8888 will throw an EXC_BAD_ACCESS error, as boxSize is set to -1.