refactoring, remove guard with fatal error

FoldingCell.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'FoldingCell'
-  s.version      = '3.0.3'
+  s.version      = '3.0.5'
   s.summary      = 'UITableViewCell with folding animation.'
   s.homepage     = 'https://github.com/Ramotion/folding-cell'
   s.license      = 'MIT'

FoldingCell/FoldingCell/FoldingCell.swift

@@ -118,22 +118,20 @@ open class FoldingCell: UITableViewCell {
     
     func configureAnimationItems(_ animationType: AnimationType) {
         
-        guard let animationViewSuperView = animationView?.subviews else {
-            fatalError()
-        }
-        
         if animationType == .open {
-            for view in animationViewSuperView.filter({ $0 is RotatedView }) {
-                view.alpha = 0
-            }
+            animationView?.subviews
+                .flatMap { $0 as? RotatedView }
+                .forEach { $0.alpha = 0 }
         } else {
-            for case let view as RotatedView in animationViewSuperView.filter({ $0 is RotatedView }) {
-                if animationType == .open {
-                    view.alpha = 0
-                } else {
-                    view.alpha = 1
-                    view.backView?.alpha = 0
-                }
+            animationView?.subviews
+                .flatMap { $0 as? RotatedView }
+                .forEach {
+                    if animationType == .open {
+                        $0.alpha = 0
+                    } else {
+                        $0.alpha = 1
+                        $0.backView?.alpha = 0
+                    }
             }
         }
     }
@@ -299,7 +297,7 @@ open class FoldingCell: UITableViewCell {
         return durations
     }
     
-    func openAnimation(_ completion: (() -> Void)?) {
+    public func openAnimation(_ completion: (() -> Void)?) {
         isUnfolded = true
         removeImageItemsFromAnimationView()
         addImageItemsToAnimationView()
@@ -346,7 +344,7 @@ open class FoldingCell: UITableViewCell {
         }
     }
     
-    func closeAnimation(_ completion: (() -> Void)?) {
+    public func closeAnimation(_ completion: (() -> Void)?) {
         isUnfolded = false
         removeImageItemsFromAnimationView()
         addImageItemsToAnimationView()