False-positive for empty_enum_arguments rule

[umbertovolta]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

The empty_enum_arguments rule matches in if statements when using dot notation on a function without parameters.

Complete output when running SwiftLint, including the stack trace and command used

$ Pods/SwiftLint/swiftlint lint empty_enum_arguments.swift
Linting Swift files at paths empty_enum_arguments.swift
Linting 'empty_enum_arguments.swift' (1/1)
/Users/umv/dev/swiftlint_test/empty_enum_arguments.swift:13:24: warning: Empty Enum Arguments Violation: Arguments can be omitted when matching enums with associated values if they are not used. (empty_enum_arguments)
Done linting! Found 1 violation, 0 serious in 1 file.

Environment

• SwiftLint version (run swiftlint version to be sure)?
  0.43.0
• Installation method used (Homebrew, CocoaPods, building from source, etc)?
  CocoaPods
• Paste your configuration file:

only_rules:
    - empty_enum_arguments

• Which Xcode version are you using (check xcodebuild -version)?
  12.4
• Do you have a sample that shows the issue? Run echo "[string here]" | swiftlint lint --no-cache --use-stdin --enable-all-rules
  to quickly test if your example is really demonstrating the issue. If your example is more
  complex, you can use swiftlint lint --path [file here] --no-cache --enable-all-rules.

struct TestSwiftlint {
  struct Person: Equatable {
    let name: String

    static func mocked(name: String = "Mock") -> Self {
      return Self(name: name)
    }
  }

  let pippo = Person(name: "Pippo")

  func check() {
    if pippo == .mocked() { // <-- empty_enum_arguments
      print("Pippo is mocked")
    } else {
      print("Pippo is real")
    }
  }
}