Conversion pipeline: When adding/removing entries to the manifest, ignore unparseable URLs instead of erroring out on them

src/calibre/ebooks/oeb/reader.py

@@ -188,8 +188,13 @@ class OEBReader(object):
                         href, _ = urldefrag(href)
                         if not href:
                             continue
+                        try:
                             href = item.abshref(urlnormalize(href))
                             scheme = urlparse(href).scheme
+                        except:
+                            self.oeb.log.exception(
+                                'Skipping invalid href: %r'%href)
+                            continue
                         if not scheme and href not in known:
                             new.add(href)
                 elif item.media_type in OEB_STYLES:

src/calibre/ebooks/oeb/transforms/trimmanifest.py

@@ -47,7 +47,10 @@ class ManifestTrimmer(object):
                    item.data is not None:
                     hrefs = [r[2] for r in iterlinks(item.data)]
                     for href in hrefs:
+                        try:
                             href = item.abshref(urlnormalize(href))
+                        except:
+                            continue
                         if href in oeb.manifest.hrefs:
                             found = oeb.manifest.hrefs[href]
                             if found not in used: