stop generating content if a template can't be parsed or rendered

Change-Id: I44fb7211fa17625dac4f2b3cb15993dbbdb2a04a
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

tools/www-generator.py

@@ -90,7 +90,7 @@ def main():
         except Exception as e:
             logger.error("parsing template %s failed: %s" %
                          (templateFile, e))
-            continue
+            raise
 
         try:
             output = template.render(projects=project_data)
@@ -99,7 +99,7 @@ def main():
         except Exception as e:
             logger.error("rendering template %s failed: %s" %
                          (templateFile, e))
-            continue
+            raise
 
         try:
             target_directory = os.path.join(args.output_directory,