destutil: raise more specific error when histedit.defaultrev is empty

Differential Revision: https://phab.mercurial-scm.org/D9313

mercurial/destutil.py

@@ -405,7 +405,7 b' def desthistedit(ui, repo):'
     elif default:
         revs = scmutil.revrange(repo, [default])
     else:
-        raise error.Abort(
+        raise error.ConfigError(
             _(b"config option histedit.defaultrev can't be empty")
         )
 

tests/test-histedit-arguments.t

@@ -127,7 +127,7 b' Test invalid config default'
 
   $ hg histedit --config "histedit.defaultrev="
   abort: config option histedit.defaultrev can't be empty
-  [255]
+  [30]
 
 Run on a revision not descendants of the initial parent
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