SessionFile::fileName can't return a empty filename

So remove code that checks for that

Change-Id: I6e717f27713fae0b7487e18a45790b82e4e1e8cd
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/projectexplorer/session.cpp

@@ -226,8 +226,6 @@ bool SessionFile::load(const QString &fileName)
 
 bool SessionFile::save()
 {
-    Q_ASSERT(!m_fileName.isEmpty());
-
     if (debug)
         qDebug() << "SessionFile - saving " << m_fileName;
 
@@ -545,11 +543,9 @@ bool SessionManager::createImpl(const QString &fileName)
         qDebug() << "SessionManager - creating new session " << fileName << " ...";
 
     bool success = true;
-
-    if (!m_file->fileName().isEmpty()) {
     if (isDefaultVirgin()) {
         // do not save initial and virgin default session
-        } else if (!save() || !clear())
+    } else if (!save() || !clear()) {
         success = false;
     }
 
@@ -588,14 +584,11 @@ bool SessionManager::loadImpl(const QString &fileName)
         qDebug() << "SessionManager - restoring session " << fileName << " ...";
 
     bool success = true;
-
-    if (!m_file->fileName().isEmpty()) {
     if (isDefaultVirgin()) {
         // do not save initial and virgin default session
     } else if (!save() || !clear()) {
         success = false;
     }
-    }
 
     m_virginSession = false;
 
@@ -1075,7 +1068,6 @@ void SessionManager::reportProjectLoadingProgress()
 
 void SessionManager::markSessionFileDirty(bool makeDefaultVirginDirty)
 {
-    if (m_file && !m_file->fileName().isEmpty())
     m_autoSaveSessionTimer->start();
     if (makeDefaultVirginDirty)
         m_virginSession = false;