dspace_statistics_api/items.py: Move util import

Move util import from global scope because it causes tests to fail.
We don't need the set up the Solr connection unless we're actually
trying to use the get_views and get_downloads methods, either when
running the API in production or during tests where the connection
has been set up.

dspace_statistics_api/items.py

@@ -1,7 +1,6 @@
 import requests
 
 from .config import SOLR_SERVER
-from .util import get_statistics_shards
 
 
 def get_views(solr_date_string: str, items: list):
@@ -12,6 +11,9 @@ def get_views(solr_date_string: str, items: list):
     :parameter items (list): a list of item IDs
     :returns: A dict of item IDs and views
     """
+    from .util import get_statistics_shards
+    shards = get_statistics_shards()
+
     # Join the UUIDs with "OR" and escape the hyphens for Solr
     solr_items_string: str = " OR ".join(items).replace("-", r"\-")
 
@@ -59,6 +61,9 @@ def get_downloads(solr_date_string: str, items: list):
     :parameter items (list): a list of item IDs
     :returns: A dict of item IDs and downloads
     """
+    from .util import get_statistics_shards
+    shards = get_statistics_shards()
+
     # Join the UUIDs with "OR" and escape the hyphens for Solr
     solr_items_string: str = " OR ".join(items).replace("-", r"\-")
 
@@ -97,7 +102,4 @@ def get_downloads(solr_date_string: str, items: list):
 
     return data
 
-
-shards = get_statistics_shards()
-
 # vim: set sw=4 ts=4 expandtab: