xattrs dict must be created first, decode xattrs as utf-8

In Python, the JSON encoder cannot process bytes, the JSON
specification also does not define a "bytes" type. We are
constrained by this in that we cannot serialize data of bytes type.

xattrs can be either strings or bytes, in practice they're likely
representable as strings, therefore, decode as utf-8, error
otherwise. If real world situation of xattrs in true binary format
arise then we will rule out another solution.

main.py

@@ -64,25 +64,28 @@ def construct_fs_tree(mp_pool=None, mp_tasks=[], cur_dict=None, path="/", dev_wh
 
                     try:
                         entry_stat = os.stat(entry_path, follow_symlinks=False)
-                    except:
+
+                    except Exception:
+                        traceback.print_exc()
                         entry_stat = None
 
                     cur_dict["childs"][entry_name] = {"stat": entry_stat,
                                                       "childs": dict()}
 
                     try:
+                        cur_dict["childs"][entry_name]["xattrs"] = dict()
                         for k in os.listxattr(entry_path, follow_symlinks=False):
-                            cur_dict["childs"][entry_name]["xattrs"][k] = str(os.getxattr(
-                                entry_path, k))
-                    except:
-                        pass
+                            cur_dict["childs"][entry_name]["xattrs"][k] = codecs.decode(
+                                os.getxattr(entry_path, k), "utf-8")
+                    except Exception:
+                        traceback.print_exc()
 
                     try:
                         cur_dict["childs"][entry_name]["posix_acls"] = codecs.decode(posix1e.ACL(file=entry_path)
                                                                                      .to_any_text(options=posix1e.TEXT_ALL_EFFECTIVE),
                                                                                      "utf-8")
-                    except:
-                        pass
+                    except Exception:
+                        traceback.print_exc()
 
                     if stat.S_ISDIR(entry_stat.st_mode):
                         construct_fs_tree(mp_pool=mp_pool, mp_tasks=mp_tasks, cur_dict=cur_dict["childs"][entry_name],