Merge pull request #21518 from Mte90/patch-1

PR: Fix not displaying math equations in the Help pane

spyder/plugins/help/utils/conf.py

@@ -37,10 +37,13 @@
 # We need jsmath to get pretty plain-text latex in docstrings
 math = CONF.get('help', 'math', '')
 
-if sphinx_version < "1.1" or not math:
-    extensions = ['sphinx.ext.jsmath']
-else:
-    extensions = ['sphinx.ext.mathjax']
+extensions = []
+
+if math:
+    if sphinx_version < "1.1":
+        extensions = ['sphinx.ext.jsmath']
+    else:
+        extensions = ['sphinx.ext.mathjax']
 
 # For scipy and matplotlib docstrings, which need this extension to
 # be rendered correctly. See spyder-ide/spyder#1138.