no style bug fix

crash when no column style applied fixed
added size to style tuple to prevent accidental compression

Author: kevmo314

pyexcelerate/Style.py

@@ -107,7 +107,7 @@ def _binary_operation(self, other, operation):
 		)
 
 	def _to_tuple(self):
-		return (self._font, self._fill, self._format, self._alignment, self._borders)
+		return (self._font, self._fill, self._format, self._alignment, self._borders, self._size)
 
 
 	def __str__(self):

pyexcelerate/templates/xl/worksheets/sheet.xml

@@ -6,7 +6,7 @@
         </sheetView>
     </sheetViews>
     <sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/>
-	<cols>{% for x, column in worksheet.col_styles %}{{ worksheet.get_col_xml_string(x) }}</col>{% endfor %}</cols>
+	{% if worksheet.col_styles %}<cols>{% for x, column in worksheet.col_styles %}{{ worksheet.get_col_xml_string(x) }}</col>{% endfor %}</cols>{% endif %}
     <sheetData>{% for x, row in worksheet.get_xml_data() %}{{ worksheet.get_row_xml_string(x) }}{% for cell in row %}{{ cell }}{% endfor %}</row>{% endfor %}</sheetData>
     {% if worksheet.merges.__len__() > 0 %}<mergeCells>{% for merge in worksheet.merges %}<mergeCell ref="{{ merge.__str__() }}"/>{% endfor %}</mergeCells>{% endif %}
     <pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3" />