fix bookloader when a bookdata is empty

core/bookloader.py

@@ -1113,6 +1113,7 @@ def add_from_bookdatas(bookdatas):
     editions = []
     for bookdata in bookdatas:
         edition = work = None
+        if bookdata and bookdata.metadata:
             loader = BasePandataLoader(bookdata.base)
             pandata = Pandata()
             pandata.metadata = bookdata.metadata

core/loaders/scrape.py

@@ -69,9 +69,12 @@ class BaseScraper(object):
                     self.set('title', '!!! missing title !!!')
                 if not self.metadata.get('language', None):
                     self.set('language', 'en')
-        else:
-            self.metadata = {}
                 self.metadata['identifiers'] = self.identifiers
+            else:
+                self.metadata = None
+        else:
+            self.metadata = None
+        
 
     #
     # utilities

core/loaders/springer.py

@@ -146,9 +146,9 @@ class SpringerScraper(BaseScraper):
             self.set('rights_url', lic_url)
 
     def get_pubdate(self):
-        pubinfo = self.doc.select_one('#copyright-info')
+        pubinfo = self.doc.find(attrs={"data-test": "electronic_isbn_publication_date"})
         if not pubinfo:
-            pubinfo = self.doc.select_one('header .c-article-identifiers')
+            pubinfo = self.doc.find(attrs={"data-test": "softcover_isbn_publication_date"})
         if pubinfo:
             for yearstring in pubinfo.stripped_strings:
                 yearmatch = HAS_YEAR.search(yearstring)