Added test for no model output and checking for no colname in firm returns.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@305 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Minor modifications.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@306 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Minor changes.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/eventstudies@307 edb9625f-4e0d-4859-8d74-9fd3b1da38cb