new function to free msrun reader shared pointer

src/core/msrun.cpp

@@ -74,6 +74,12 @@ MsRun::getMsRunReaderSp()
   return _msrun_reader_sp;
 }
 
+void
+MsRun::freeMsRunReaderSp()
+{
+  _msrun_reader_sp = nullptr;
+}
+
 void
 MsRun::setMsRunStatistics(MsRunStatistics param, const QVariant &value)
 {

src/core/msrun.h

@@ -70,6 +70,10 @@ class MsRun : public pappso::MsRunId
   bool findMsRunFile();
 
   pappso::MsRunReaderSp &getMsRunReaderSp();
+  
+  /** @brief release shared pointer on MSrun reader
+   */
+  void freeMsRunReaderSp();
 
   void checkMsRunStatistics();