Remove unnecessary nil-coalescing operator.
Remove unnecessary nil-coalescing operator.

The operand on the left is not an optional, so this has no effect.

sschiau/swift-package-manager,sschiau/swift-package-manager,apple/swift-package-manager,JGiola/swift-package-manager,haskellswift/swift-package-manager,JGiola/swift-package-manager,haskellswift/swift-package-manager,vmanot/swift-package-manager,sschiau/swift-package-manager,mxcl/swift-package-manager,apple/swift-package-manager,vmanot/swift-package-manager,apple/swift-package-manager,mxcl/swift-package-manager,JGiola/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,vmanot/swift-package-manager,apple/swift-package-manager,mxcl/swift-package-manager,sschiau/swift-package-manager,haskellswift/swift-package-manager,abertelrud/swift-package-manager,vmanot/swift-package-manager,JGiola/swift-package-manager,vmanot/swift-package-manager,haskellswift/swift-package-manager,mxcl/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,JGiola/swift-package-manager,abertelrud/swift-package-manager,sschiau/swift-package-manager