OptionalCollection+IsNilOrEmpty.swift

extension Optional where Wrapped: Collection {

    var isNilOrEmpty: Bool {
        return self?.isEmpty ?? true
    }
}

// MARK: - Tests

func testNilOrEmpty() {
    let nilString: String? = nil
    XCTAssertTrue(nilString.isNilOrEmpty)

    let emptyString: String? = ""
    XCTAssertTrue(emptyString.isNilOrEmpty)

    let someText: String? = "lorem"
    XCTAssertFalse(someText.isNilOrEmpty)
}