Update FileHandler.java

Author: jansoren

src/main/java/io/github/filelize/file/FileHandler.java

@@ -44,7 +44,7 @@ public <T> Map<String, T> readFileMap(String fullPath, Class<T> valueType) throw
             JavaType mapType = objectMapper.getTypeFactory().constructMapType(Map.class, String.class, valueType);
             return objectMapper.readValue(json.traverse(), mapType);
         } catch (NoSuchFileException e) {
-            return null;
+            return new HashMap<>();
         }
     }