Fix logic for turning off sky subtraction #59
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As reported in #58,
skysuboption inAstroDrizzleis broken and settingskysubtoFalsedoes not turn off subtraction ofMDRIZSKYvalues read from image headers during initialization ofAstroDrizzle.Initially, the capability of turning off sky subtraction was introduced in https://trac.stsci.edu/ssb/stsci_python/ticket/1208 but, unfortunately, it works only when
MDRIZSKYis not present in image headers.This PR fixes the logic for turning off sky subtraction.
CC: @stsci-hack