Remove any remaining blank tags and enforce on DB level

chrome/content/zotero/xpcom/schema.js

@@ -2487,6 +2487,11 @@ Zotero.Schema = new function(){
 					Zotero.DB.query("UPDATE itemNotes SET sourceItemID=NULL WHERE sourceItemID IN (SELECT itemID FROM items WHERE itemTypeID IN (1,14))");
 				}
 				
+				if (i==66) {
+					Zotero.DB.query("DELETE FROM itemTags WHERE tagID IN (SELECT tagID FROM tags WHERE TRIM(name)='')");
+					Zotero.DB.query("DELETE FROM tags WHERE TRIM(name)=''");
+				}
+				
 				Zotero.wait();
 			}
 			

triggers.sql

@@ -1,4 +1,4 @@
--- 14
+-- 15
 
 -- Triggers to validate date field
 DROP TRIGGER IF EXISTS insert_date_field;
@@ -1388,3 +1388,21 @@ CREATE TRIGGER fku_proxies_proxyID_proxyHosts_proxyID
     SELECT RAISE(ABORT, 'update on table "proxies" violates foreign key constraint "fku_proxies_proxyID_proxyHosts_proxyID"')
     WHERE (SELECT COUNT(*) FROM proxyHosts WHERE proxyID = OLD.proxyID) > 0;
   END;
+
+-- Make sure tags aren't empty
+DROP TRIGGER IF EXISTS fki_tags;
+CREATE TRIGGER fki_tags
+BEFORE INSERT ON tags
+  FOR EACH ROW BEGIN
+    SELECT RAISE(ABORT, 'Tag cannot be blank')
+    WHERE TRIM(NEW.name)='';
+  END;
+
+DROP TRIGGER IF EXISTS fku_tags;
+CREATE TRIGGER fku_tags
+  BEFORE UPDATE OF name ON tags
+  FOR EACH ROW BEGIN
+      SELECT RAISE(ABORT, 'Tag cannot be blank')
+      WHERE TRIM(NEW.name)='';
+  END;
+

userdata.sql

@@ -1,4 +1,4 @@
--- 65
+-- 66
 
 -- This file creates tables containing user-specific data for new users --
 -- any changes made here must be mirrored in transition steps in schema.js::_migrateSchema()