trivial: fix consider-using-ternary pylint warning (#52732)

pylint.rc

@@ -14,7 +14,6 @@ disable=
     broad-except,
     consider-using-dict-comprehension,
     consider-using-set-comprehension,
-    consider-using-ternary,
     cyclic-import,
     deprecated-module,
     disallowed-name,

wcs/qommon/form.py

@@ -209,7 +209,7 @@ class SubmitWidget(quixote.form.widget.SubmitWidget):
     def render_content(self):
         if self.name in ('cancel', 'previous', 'save-draft'):
             self.attrs['formnovalidate'] = 'formnovalidate'
-        value = self.label and htmlescape(self.label) or None
+        value = htmlescape(self.label) if self.label else None
         return (
             htmltag('button', name=self.name, value=value, **self.attrs) + self.label + htmltext('</button>')
         )