Fix export measurement separator to CSV.

ChangeLog.txt

@@ -3,6 +3,7 @@
 - Fix visualization for tool Point from circle and tangent.
 - Fix loading background image.
 - [smart-pattern/valentina#187] Puzzle: message "Invalid version: Max supported version 0.1.2" when opening 0.1.1 file in Val 0.7.52.
+- Fix export measurement separator to CSV.
 
 # Valentina 0.7.52 September 12, 2022
 - Fix crash when default locale is ru.

src/app/tape/tmainwindow.cpp

@@ -816,8 +816,12 @@ void TMainWindow::ExportToCSVData(const QString &fileName, bool withHeader, int
         {
             if (not ui->tableWidget->isColumnHidden(column))
             {
-                QTableWidgetItem *header = ui->tableWidget->horizontalHeaderItem(column);
+                QString text;
-                csv.setHeaderText(colCount, header->text());
+                if (QTableWidgetItem *header = ui->tableWidget->horizontalHeaderItem(column))
+                {
+                    text = header->text();
+                }
+                csv.setHeaderText(colCount, text);
                 ++colCount;
             }
         }
@@ -832,8 +836,12 @@ void TMainWindow::ExportToCSVData(const QString &fileName, bool withHeader, int
         {
             if (not ui->tableWidget->isColumnHidden(column))
             {
-                QTableWidgetItem *item = ui->tableWidget->item(row, column);
+                QString text;
-                csv.setText(row, colCount, item->text());
+                if(QTableWidgetItem *item = ui->tableWidget->item(row, column))
+                {
+                    text = item->text();
+                }
+                csv.setText(row, colCount, text);
                 ++colCount;
             }
         }