...

src/calibre/ebooks/metadata/sources/google.py

@@ -50,7 +50,7 @@ def get_details(browser, url, timeout): # {{{
         if gc() != 403:
             raise
         # Google is throttling us, wait a little
-        time.sleep(1)
+        time.sleep(2)
         raw = browser.open_novisit(url, timeout=timeout).read()
 
     return raw

src/calibre/ebooks/oeb/base.py

@@ -229,7 +229,11 @@ def rewrite_links(root, link_repl_func, resolve_base_href=False):
         if 'style' in el.attrib:
             text = el.attrib['style']
             if _css_url_re.search(text) is not None:
-                stext = parseStyle(text)
+                try:
+                    stext = parseStyle(text)
+                except:
+                    # Parsing errors are raised by cssutils
+                    continue
                 for p in stext.getProperties(all=True):
                     v = p.cssValue
                     if v.CSS_VALUE_LIST == v.cssValueType: