[fix] check for column field dict before appending child table data field

frappe/www/print.py

@@ -232,6 +232,11 @@ def make_layout(doc, meta, format_data=None):
 
 	def get_new_section(): return  {'columns': [], 'has_data': False}
 
+	def append_empty_field_dict_to_page_column(page):
+		""" append empty columns dict to page layout """
+		if not page[-1]['columns']:
+			page[-1]['columns'].append({'fields': []})
+
 	for df in format_data or meta.fields:
 		if format_data:
 			# embellish df with original properties
@@ -263,16 +268,13 @@ def make_layout(doc, meta, format_data=None):
 
 		else:
 			# add a column if not yet added
-			if not page[-1]['columns']:
-				page[-1]['columns'].append({'fields': []})
+			append_empty_field_dict_to_page_column(page)
 
 		if df.fieldtype=="HTML" and df.options:
 			doc.set(df.fieldname, True) # show this field
 
 		if is_visible(df, doc) and has_value(df, doc):
-			if page[-1]['columns'] == []:
-				# if no column, add one
-				page[-1]['columns'].append({'fields': []})
+			append_empty_field_dict_to_page_column(page)
 
 			page[-1]['columns'][-1]['fields'].append(df)
 
@@ -293,6 +295,7 @@ def make_layout(doc, meta, format_data=None):
 						# new page, with empty section and column
 						page = [get_new_section()]
 						layout.append(page)
+						append_empty_field_dict_to_page_column(page)
 
 						# continue the table in a new page
 						df = copy.copy(df)