There’s an exchange in an early cut of the series premiere of “Private Practice,” the “Grey’s Anatomy” spinoff featuring Addison Montgomery (Kate Walsh). In a long passionate speech, the good and single doctor explains to her boss why she’s quitting her enviable, high-powered job at his Seattle hospital and relocating to Malibu. “I want to throw my hat all the way up in the air!” she sings out triumphantly, effectively shutting down his protests. Anyone who has watched “The Mary Tyler Moore Show” could understand what Addison meant: She is choosing to be free and clear, to have every choice in front of her, to actualize without apology. That exchange didn’t make the final edit of “Private Practice” that aired, and that’s actually a good thing. Only one woman could pull off that move, and that’s Mary Tyler Moore. Millions of us imagined ourselves trying to throw that metaphorical hat and still envision doing so 40 years after “The Mary Tyler Moore Show” aired its final episode. Moore, a seven-time Emmy winner, passed away on Wednesday at the age of …