title: Sonarqube error : The main branch of this project is empty
body: <p>Today I installed sonarqube and sonarqube runner to scan my php project . But after running the scanner it shows <strong>The main branch of this project is empty.</strong> .</p>
  <p><strong>sonar-scanner.properties</strong></p>
  <pre><code>#Configure here general information about the environment, such as SonarQube server connection details for example
  #No information about specific project should appear here
  
  #----- Default SonarQube server
  #sonar.host.url=http://localhost:9000
  
  #----- Default source code encoding
  #sonar.sourceEncoding=UTF-8
  
  
  sonar.projectKey=raka
  # --- optional properties ---
  
  # defaults to project key
  #sonar.projectName=My project
  # defaults to 'not provided'
  #sonar.projectVersion=1.0
   
  # Path is relative to the sonar-project.properties file. Defaults to .
  #sonar.sources=.
   
  # Encoding of the source code. Default is default system encoding
  #sonar.sourceEncoding=UTF-8
  </code></pre>
  <p>Can anyone tell me what i did wrong? Please help I am new in PHP</p>