Updated missing file handlers to be simpler

Fixes #229

Author: dimitribouniol

Sources/CodableDatastore/Persistence/Disk Persistence/DiskPersistence.swift

@@ -144,9 +144,7 @@ extension DiskPersistence {
 
             cachedStoreInfo = storeInfo
             return storeInfo
-        } catch URLError.fileDoesNotExist, CocoaError.fileReadNoSuchFile {
-            return StoreInfo(modificationDate: Date())
-        } catch let error as NSError where error.domain == NSPOSIXErrorDomain && error.code == Int(POSIXError.ENOENT.rawValue) {
+        } catch URLError.fileDoesNotExist, CocoaError.fileNoSuchFile, CocoaError.fileReadNoSuchFile, POSIXError.ENOENT {
             return StoreInfo(modificationDate: Date())
         } catch {
             throw error

Sources/CodableDatastore/Persistence/Disk Persistence/Snapshot/Snapshot.swift

@@ -112,9 +112,7 @@ extension Snapshot {
 
             cachedManifest = manifest
             return manifest
-        } catch URLError.fileDoesNotExist, CocoaError.fileReadNoSuchFile {
-            return SnapshotManifest(id: id, modificationDate: Date())
-        } catch let error as NSError where error.domain == NSPOSIXErrorDomain && error.code == Int(POSIXError.ENOENT.rawValue) {
+        } catch URLError.fileDoesNotExist, CocoaError.fileNoSuchFile, CocoaError.fileReadNoSuchFile, POSIXError.ENOENT {
             return SnapshotManifest(id: id, modificationDate: Date())
         } catch {
             throw error