Fixed relativePath(of:) crash

FileProvider.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   #
 
   s.name         = "FileProvider"
-  s.version      = "0.14.3"
+  s.version      = "0.14.4"
   s.summary      = "FileManager replacement for Local and Remote (WebDAV/Dropbox/OneDrive/SMB2) files on iOS and macOS."
 
   # This description is used to generate tags and improve search results.

FileProvider.xcodeproj/project.pbxproj

@@ -605,7 +605,7 @@
 		799396601D48B7BF00086753 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.14.3;
+				BUNDLE_VERSION_STRING = 0.14.4;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -635,7 +635,7 @@
 		799396611D48B7BF00086753 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.14.3;
+				BUNDLE_VERSION_STRING = 0.14.4;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;

Sources/FileProvider.swift

@@ -637,15 +637,17 @@ extension FileProviderBasic {
     /// - Returns: A `String` contains relative path of url against base url.
     public func relativePathOf(url: URL) -> String {
         // check if url derieved from current base url
-        if !url.relativePath.isEmpty, url.baseURL == self.baseURL {
-            return url.relativePath.removingPercentEncoding!
+        let relativePath = url.relativePath
+        if !relativePath.isEmpty, url.baseURL == self.baseURL {
+            return relativePath.removingPercentEncoding ?? relativePath
         }
 
         // resolve url string against baseurl
         guard let baseURL = self.baseURL?.standardizedFileURL else { return url.absoluteString }
         let standardPath = url.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
         let standardBase = baseURL.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
-        return standardPath.replacingOccurrences(of: standardBase, with: "/").removingPercentEncoding!
+        let standardRelativePath = standardPath.replacingOccurrences(of: standardBase, with: "/")
+        return standardRelativePath.removingPercentEncoding ?? standardRelativePath
     }
 
     internal func correctPath(_ path: String?) -> String? {

Sources/LocalFileProvider.swift

@@ -480,7 +480,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
     open func registerNotifcation(path: String, eventHandler: @escaping (() -> Void)) {
         self.unregisterNotifcation(path: path)
         let dirurl = self.url(of: path)
-        let isdir = (try? dirurl.resourceValues(forKeys: [.isDirectoryKey]).isDirectory ?? false) ?? false
+        let isdir = (try? dirurl.resourceValues(forKeys: [.isDirectoryKey]))?.isDirectory ?? false
         if !isdir {
             return
         }