CTestSVN: Fix segfault when CTEST_UPDATE_VERSION_ONLY is enabled

Before the change the list of externals was queried only
before the svn update.

With the change the list is queried both before and after.
This should also be more accurate since the list of externals might
change during the update.

Source/CTest/cmCTestSVN.cxx

@@ -108,13 +108,8 @@ std::string cmCTestSVN::LoadInfo(SVNInfo& svninfo)
 
 void cmCTestSVN::NoteOldRevision()
 {
-  // Info for root repository
-  this->Repositories.push_back(SVNInfo(""));
-  this->RootInfo = &(this->Repositories.back());
-  // Info for the external repositories
-  this->LoadExternals();
+  this->LoadRepositories();
 
-  // Get info for all the repositories
   std::list<SVNInfo>::iterator itbeg = this->Repositories.begin();
   std::list<SVNInfo>::iterator itend = this->Repositories.end();
   for (; itbeg != itend; itbeg++) {
@@ -134,7 +129,8 @@ void cmCTestSVN::NoteOldRevision()
 
 void cmCTestSVN::NoteNewRevision()
 {
-  // Get info for the external repositories
+  this->LoadRepositories();
+
   std::list<SVNInfo>::iterator itbeg = this->Repositories.begin();
   std::list<SVNInfo>::iterator itend = this->Repositories.end();
   for (; itbeg != itend; itbeg++) {
@@ -534,8 +530,13 @@ private:
   }
 };
 
-void cmCTestSVN::LoadExternals()
+void cmCTestSVN::LoadRepositories()
 {
+  // Info for root repository
+  this->Repositories.clear();
+  this->Repositories.push_back(SVNInfo(""));
+  this->RootInfo = &(this->Repositories.back());
+
   // Run "svn status" to get the list of external repositories
   std::vector<const char*> svn_status;
   svn_status.push_back("status");

Source/CTest/cmCTestSVN.h

@@ -86,7 +86,7 @@ private:
   SVNInfo* RootInfo;
 
   std::string LoadInfo(SVNInfo& svninfo);
-  void LoadExternals();
+  void LoadRepositories();
   void LoadModifications() CM_OVERRIDE;
   void LoadRevisions() CM_OVERRIDE;
   void LoadRevisions(SVNInfo& svninfo);