sometimes reverts fail, yo

lib/gollum/wiki.rb

@@ -320,6 +320,7 @@ module Gollum
       patch   = full_reverse_diff_for(page, sha1, sha2)
       commit[:parent] = [pcommit]
       commit[:tree]   = @repo.git.apply_patch(pcommit.sha, patch)
+      return false unless commit[:tree]
 
       index = nil
       sha1  = commit_index(commit) { |i| index = i }

test/test_page.rb

@@ -161,4 +161,9 @@ context "Page Reverting" do
     assert_equal sha,       page2.version.sha
     assert_equal "INITIAL", page2.raw_data.strip
   end
+
+  test "cannot revert conflicting commit" do
+    page1 = @wiki.page('A')
+    assert_equal false, @wiki.revert_page(page1, '302a5491a9a5ba12c7652ac831a44961afa312d2')
+  end
 end