Comment where xml writing functions may throw

src/blockfile/LegacyAliasBlockFile.cpp

@@ -62,6 +62,7 @@ BlockFilePtr LegacyAliasBlockFile::Copy(wxFileNameWrapper &&newFileName)
 }
 
 void LegacyAliasBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    xmlFile.StartTag(wxT("legacyblockfile"));
 

src/blockfile/LegacyBlockFile.cpp

@@ -197,6 +197,7 @@ size_t LegacyBlockFile::ReadData(samplePtr data, sampleFormat format,
 }
 
 void LegacyBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    xmlFile.StartTag(wxT("legacyblockfile"));
 

src/blockfile/ODDecodeBlockFile.cpp

@@ -191,6 +191,7 @@ BlockFilePtr ODDecodeBlockFile::Copy(wxFileNameWrapper &&newFileName)
 /// Most notably, the summaryfile attribute refers to a file that does not yet, so when the project file is read back in
 /// and this object reconstructed, it needs to avoid trying to open it as well as schedule itself for OD loading
 void ODDecodeBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    LockRead();
    if(IsSummaryAvailable())

src/blockfile/ODPCMAliasBlockFile.cpp

@@ -227,6 +227,7 @@ BlockFilePtr ODPCMAliasBlockFile::Copy(wxFileNameWrapper &&newFileName)
 /// Most notably, the summaryfile attribute refers to a file that does not yet exist, so when the project file is read back in
 /// and this object reconstructed, it needs to avoid trying to open it as well as schedule itself for OD loading
 void ODPCMAliasBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    //we lock this so that mAliasedFileName doesn't change.
    LockRead();

src/blockfile/PCMAliasBlockFile.cpp

@@ -101,6 +101,7 @@ BlockFilePtr PCMAliasBlockFile::Copy(wxFileNameWrapper &&newFileName)
 }
 
 void PCMAliasBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    xmlFile.StartTag(wxT("pcmaliasblockfile"));
 

src/blockfile/SilentBlockFile.cpp

@@ -39,6 +39,7 @@ size_t SilentBlockFile::ReadData(samplePtr data, sampleFormat format,
 }
 
 void SilentBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    xmlFile.StartTag(wxT("silentblockfile"));
 

src/blockfile/SimpleBlockFile.cpp

@@ -404,6 +404,7 @@ size_t SimpleBlockFile::ReadData(samplePtr data, sampleFormat format,
 }
 
 void SimpleBlockFile::SaveXML(XMLWriter &xmlFile)
+// may throw
 {
    xmlFile.StartTag(wxT("simpleblockfile"));