By Tzvi Machlin The Arizona Cardinals have had struggles at kicker this year between injuries and misses. But one kicker’s struggles is another kicker’s opportunities. On Wednesday, the Cardinals announced that they have signed veteran kicker Rodrigo Blankenship to their active roster. Blankenship was previously elevated from their practice squad for their win over the New Orleans Saints that week. The Cardinals have been without starting kicker Matt Prater for the past three weeks due to an injury. This move suggests that Prater still isn’t ready to return. Initially, the Cardinals went with …