Fixed API routes do not return appropriate response codes

Fixed API routes with appropriate return response codes

Includes the following routes:

• GET /api/campaigns//stats_by_date
• GET /api/get-campaign-categories
• GET /api/get-campaign-graph-stats-data
• GET /api/search-depicts/
• POST /api/reject-suggestion
• GET /api/get-rejected-statements
• GET /campaigns//table

Bug: T295486 Change-Id: Ifb8f9185a1f515434145c5ef2643cc8c9e4819a3

Closes T295486