ExcelGraphItem.title can be None

Author: alixdamman

larray/inout/xw_reporting.py

@@ -571,7 +571,7 @@ def __init__(self, data, title, template, top, left, width, height):
             ItemSize.__init__(self, width, height)
             self.top = top
             self.left = left
-            self.title = str(title) if title is not None else ''
+            self.title = str(title) if title is not None else None
             data = aslarray(data)
             if not (1 <= data.ndim <= 2):
                 raise ValueError("Expected 1D or 2D array for data argument. "
@@ -601,8 +601,9 @@ def dump(self, sheet, data_sheet, row):
             source = data_range(data_cells(row, 1), data_cells(last_row, last_col))
             obj_chart.SetSourceData(source)
             obj_chart.ChartType = ChartType.xlLine
-            obj_chart.HasTitle = True
-            obj_chart.ChartTitle.Caption = self.title
+            if self.title is not None:
+                obj_chart.HasTitle = True
+                obj_chart.ChartTitle.Caption = self.title
             obj_chart.Legend.Position = LegendPosition.xlLegendPositionBottom
             if self.template is not None:
                 obj_chart.ApplyChartTemplate(self.template)