Update some minor mistakes in logic and style issues

Author: Jianwen0451

src/main/java/seedu/address/logic/LogicManager.java

@@ -100,7 +100,7 @@ private void updateModelWithStorage(Command command, Storage storage, Model mode
                 model.setAddressBook(storage.readAddressBook(((LoadCommand) command).getLoadPath()).get());
             }
         } catch (DataLoadingException e) {
-            throw new CommandException(String.format(LOAD_ERROR_FORMAT, e.getMessage()),e);
+            throw new CommandException(String.format(LOAD_ERROR_FORMAT, e.getMessage()), e);
         }
 
     }

src/main/java/seedu/address/logic/parser/ParserUtil.java

@@ -147,7 +147,7 @@ public static Path parsePathWithCheck(String path) throws ParseException {
         path = path.trim();
         final Path parsedPath = Paths.get("archived", path);
         if (!path.endsWith(".json") || path.contains("/") || !Files.exists(parsedPath)
-                || Files.isRegularFile(parsedPath)) {
+                || !Files.isRegularFile(parsedPath)) {
             throw new ParseException(LoadCommand.MESSAGE_USAGE);
         }
         return parsedPath;