Minor changes in Optional Collection extensions. 🚀 (#1110)

- Instead of checking for nil using guard statements we are using self and some basic conditions
- This optimises the performance significantly considering that collection size can be bigger and checking using guard can be expensive.

---------

Co-authored-by: Mayank <>

Sources/SwifterSwift/SwiftStdlib/OptionalExtensions.swift

@@ -91,15 +91,12 @@ public extension Optional {
 public extension Optional where Wrapped: Collection {
     /// SwifterSwift: Check if optional is nil or empty collection.
     var isNilOrEmpty: Bool {
-        guard let collection = self else { return true }
-        return collection.isEmpty
+        return self?.isEmpty ?? true
     }
 
     /// SwifterSwift: Returns the collection only if it is not nil and not empty.
     var nonEmpty: Wrapped? {
-        guard let collection = self else { return nil }
-        guard !collection.isEmpty else { return nil }
-        return collection
+        return (self?.isEmpty ?? true) ? nil : self
     }
 }