fixes for upgrade schema script

app/models/post.rb

@@ -292,7 +292,7 @@ class Post < ActiveRecord::Base
         raise PostFlag::Error.new("Post is locked and cannot be flagged")
       end
       
-      flag = flags.create(:reason => reason)
+      flag = flags.create(:reason => reason, :is_resolved => false)
       
       if flag.errors.any?
         raise PostFlag::Error.new(flag.errors.full_messages.join("; "))

app/models/tag.rb

@@ -343,7 +343,7 @@ class Tag < ActiveRecord::Base
     end
     
     def should_update_related?
-      related_tags.blank? || related_tags_updated_at < related_cache_expiry.hours.ago
+      related_tags.blank? || related_tags_updated_at.blank? || related_tags_updated_at < related_cache_expiry.hours.ago
     end
     
     def related_tag_array

app/models/user.rb

@@ -26,7 +26,6 @@ class User < ActiveRecord::Base
   validates_confirmation_of :password
   validates_presence_of :email, :if => lambda {|rec| rec.new_record? && Danbooru.config.enable_email_verification?}
   validate :validate_ip_addr_is_not_banned, :on => :create
-  before_validation :convert_blank_email_to_null
   before_validation :normalize_blacklisted_tags
   before_create :encrypt_password_on_create
   before_update :encrypt_password_on_update
@@ -303,12 +302,6 @@ class User < ActiveRecord::Base
         raise User::Error.new("Verification key does not match")
       end
     end
-    
-    def convert_blank_email_to_null
-      if email.blank?
-        self.email = nil
-      end
-    end
   end
   
   module BlacklistMethods