Resolve #369,#370

add error return value

exported functions:

GetMergeCells
ProtectSheet
UnprotectSheet
UpdateLinkedValue
GetMergeCells
SetSheetVisible

inner functions:

workSheetReader
copySheet

1 files changed, 4 insertions, 1 deletions

diff --git a/chart.go b/chart.go
index 5429b77..c657be8 100644
--- a/chart.go
+++ b/chart.go
@@ -449,7 +449,10 @@ func (f *File) AddChart(sheet, cell, format string) error {
 		return err
 	}
 	// Read sheet data.
-	xlsx := f.workSheetReader(sheet)
+	xlsx, err := f.workSheetReader(sheet)
+	if err != nil {
+		return err
+	}
 	// Add first picture for given sheet, create xl/drawings/ and xl/drawings/_rels/ folder.
 	drawingID := f.countDrawings() + 1
 	chartID := f.countCharts() + 1