Fix sconstruct, which was broken by the template.

Reverts the two previous attempts in 8502a29 and a9b58b5

Author: Luke Davis

sconstruct

@@ -289,9 +289,6 @@ for dir in langDirs:
 	)
 	env.Depends(translatedManifest, ["buildVars.py"])
 	env.Depends(addon, [translatedManifest, moFile])
-else:  # Provide defaults for variables which didn't get assigned in above loop
-	poFile = None
-	moFile = None
 
 pythonFiles = expandGlobs(buildVars.pythonSources)
 for file in pythonFiles:
@@ -300,9 +297,16 @@ for file in pythonFiles:
 # Convert markdown files to html
 # We need at least doc in English and should enable the Help button for the add-on in Add-ons Manager
 createAddonHelp("addon")
+try:
+	
 for mdFile in env.Glob(os.path.join('addon', 'doc', '*', '*.md')):
 	htmlFile = env.markdown(mdFile)
-	env.Depends(htmlFile, [mdFile, moFile])
+	try:  # It is possible that no moFile was set, because an add-on has no translations.
+		moFile
+	except NameError:  # Done if there is no moFile
+		env.Depends(htmlFile, mdFile)
+	else:  # Done if there is a moFile
+		env.Depends(htmlFile, [mdFile, moFile])
 	env.Depends(addon, htmlFile)
 
 # Pot target