Added test script for TemplateError trapping

tests/template_error.py

@@ -0,0 +1,15 @@
+from docxtpl import DocxTemplate, RichText
+from jinja2.exceptions import TemplateError
+
+try:
+    tpl = DocxTemplate('test_files/template_error_tpl.docx')
+    tpl.render({
+        'test_variable' : 'test variable value'
+    })
+except TemplateError as the_error:
+    print unicode(the_error)
+    if hasattr(the_error, 'docx_context'):
+        print "Context:"
+        for line in the_error.docx_context:
+            print line
+tpl.save('test_files/template_error.docx')