mis_builder: fix typo, causes crash if report_xslx is missing (#195)

[FIX] mis_builder: crash if report_xslx is missing

mis_builder/report/mis_report_instance_xlsx.py

@@ -17,7 +17,8 @@ try:
 except ImportError:
     _logger.debug("report_xlsx not installed, Excel export non functional")
 
-    class ReportXslx:
+    class ReportXlsx(object):
+        def __init__(self, *args, **kwargs):
             pass
 
 
@@ -27,11 +28,11 @@ MIN_COL_WIDTH = 10  # characters
 MAX_COL_WIDTH = 50  # characters
 
 
-class MisBuilderXslx(ReportXlsx):
+class MisBuilderXlsx(ReportXlsx):
 
     def __init__(self, name, table, rml=False, parser=False, header=True,
                  store=False):
-        super(MisBuilderXslx, self).__init__(
+        super(MisBuilderXlsx, self).__init__(
             name, table, rml, parser, header, store)
 
     def generate_xlsx_report(self, workbook, data, objects):
@@ -136,5 +137,5 @@ class MisBuilderXslx(ReportXlsx):
         sheet.set_column(min_col_pos, max_col_pos, data_col_width * COL_WIDTH)
 
 
-MisBuilderXslx('report.mis.report.instance.xlsx',
+MisBuilderXlsx('report.mis.report.instance.xlsx',
                'mis.report.instance', parser=report_sxw.rml_parse)