From Sergei Linev: When an xmlfile was created without streamerinfos (by default streamerinfos always stored), it can not be opened for reading because TFile::ReadStreamerInfo requires the StreamerInfo to be present.  This patch fixes the problem for TXMLFile.
From Sergei Linev:
When an xmlfile was created without streamerinfos (by default streamerinfos
always stored), it can not be opened for reading because TFile::ReadStreamerInfo
requires the StreamerInfo to be present.  This patch fixes the problem for
TXMLFile.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@13548 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root