eol: fix crash when handling removed files

ci --amend would in some cases fail after 2eef89bfd70d failed to refactor the
eol extension too.

hgext/eol.py

@@ -333,10 +333,10 @@ def reposetup(ui, repo):
             for f in sorted(ctx.added() + ctx.modified()):
                 if not self._eolfile(f):
                     continue
-                try:
-                    data = ctx[f].data()
-                except IOError:
+                fctx = ctx[f]
+                if fctx is None:
                     continue
+                data = fctx.data()
                 if util.binary(data):
                     # We should not abort here, since the user should
                     # be able to say "** = native" to automatically

tests/test-eol.t

@@ -525,4 +525,19 @@ append a line without trailing newline
   fourth
   fifth
 
+amend of changesets with renamed/deleted files expose new code paths
+
+  $ hg mv a.txt b.txt
+  $ hg ci --amend -q
+  $ hg diff -c.
+  diff --git a/a.txt b/b.txt
+  rename from a.txt
+  rename to b.txt
+  --- a/a.txt
+  +++ b/b.txt
+  @@ -1,2 +1,3 @@
+   third
+   fourth
+  +fifth
+
   $ cd ..