fix: Skip sentiment analysis for blank text (chatwoot#7580)

Co-authored-by: Sojan Jose <[email protected]>

enterprise/app/jobs/enterprise/sentiment_analysis_job.rb

@@ -2,8 +2,7 @@ class Enterprise::SentimentAnalysisJob < ApplicationJob
  queue_as :low
 
  def perform(message)
- return if message.account.locale != 'en'
- return if valid_incoming_message?(message)
+ return if message.account.locale != 'en' || !valid_incoming_message?(message)
 
  save_message_sentiment(message)
  rescue StandardError => e
@@ -39,7 +38,7 @@ def label_val(sentiment)
  end
 
  def valid_incoming_message?(message)
- !message.incoming? || message.private?
+ message.incoming? && message.content.present? && !message.private?
  end
 
  # returns the sentiment file from vendor folder else download it to the path from AWS-S3