fix: Delete patient error while patient finish scan process.

src/utilities/ScanProcessSequence.cpp

@@ -32,7 +32,12 @@ void ScanProcessSequence::pushPosition(ScanPosition aPostion)
 
 ScanPosition ScanProcessSequence::popPosition()
 {
-    return mScanProtocol.pop();
+    ScanPosition result = mScanProtocol.pop();
+    if(mScanProtocol.size() == 0)
+    {
+        emit ScanProcessSequenceFinished();
+    }
+    return result;
 }
 
 ScanPosition ScanProcessSequence::topPosition()