Disable pagination when page-size is 0 or -1

When --page-size <-1, raise error info.

JIRA: PDC-1636

pdc_client/__init__.py

@@ -190,8 +190,15 @@ def get_paged(self, res, **kwargs):
             for release in client.get_paged(client['releases']._, active=True):
                 ...
         """
-        if self.page_size:
+        if self.page_size >= -1:
             kwargs['page_size'] = self.page_size
+        else:
+            print("'%s' is a invalid number, please verify it again." % self.page_size)
+            sys.exit(1)
+
+        if self.page_size in [0, -1]:
+            # When page-size is 0 or -1, which disable pagination.
+            return res(**kwargs)
 
         def worker():
             kwargs['page'] = 1