scm: git: raise exception if "git log" is error and block is given in lib revision method (#8857)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8837 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/git_adapter.rb

@@ -290,8 +290,13 @@ module Redmine
           end
           revs
         rescue ScmCommandAborted => e
-          logger.error("git log #{from_to.to_s} error: #{e.message}")
-          revs
+          err_msg = "git log error: #{e.message}"
+          logger.error(err_msg)
+          if block_given?
+            raise CommandFailed, err_msg
+          else
+            revs
+          end
         end
 
         def diff(path, identifier_from, identifier_to=nil)