bot.pl.json config validation

[pavelsr]

E.g. I forgot to set <GOOGLE_CALENDAR_ID> in resources. So bot will fail:

2017-03-03T11:36:27 [2] new message: {chat => {first_name => 'Pavel',id => '218718957',last_name => 'Serikov',type => 'private',username => 'serikoff'},contact => {first_name => 'Pavel',last_name => 'Serikov',phone_number => '79885851900',user_id => 218718957},date => 1488530187,from => {first_name => 'Pavel',id => '218718957',last_name => 'Serikov',username => 'serikoff'},message_id => 1655}
2017-03-03T11:36:28 [2] message sent: {chat_id => '218718957',text => 'OK, приступим 👌'}
$VAR1 = {
          'client_secret' => 'Blv-xrSaz2W-yhDzDhFSrrej',
          'client_id' => '397141148797-hnbm3cl49buonsdfa982iamefll5bpn9.apps.googleusercontent.com',
          'refresh_token' => '1/c5xfuGieMfzMbC1nLi5YyLsKsSsA-sTjVA3QKv7uiqs115dC6v_OCK_YeGhbsop7'
        };
$VAR1 = {
          'expires_in' => 3600,
          'access_token' => 'ya29.GlsCBER0TErdvYofimsUgHpolNnB5Fp6ac3gJT4fLzf4LtN8403oPrcYVJuHDKc4c_19_S6oDf5NI1rxIWrWtF1wcza3hC6MrWqqL3bD9CIWXfsoa9srz8O0vYoj',
          'token_type' => 'Bearer',
          'id_token' => 'eyJhbGciOiJSUzI1NiIsImtpZCI6IjU2MjI2YWVlZTNkMWZiZGFhOTQxNGVlMGFkZjdhZDQ4MTY1MDJiYjEifQ.eyJpc3MiOiJodHRwczovL2FjY291bnRzLmdvb2dsZS5jb20iLCJpYXQiOjE0ODg1MzAxODgsImV4cCI6MTQ4ODUzMzc4OCwiYXRfaGFzaCI6IkJpX09YN0U2dFJyVDg5SVNXMzhnSVEiLCJhdWQiOiIzOTcxNDExNDg3OTctaG5ibTNjbDQ5YnVvbmVjcWE5ODJpYW1lZmxsNWJwbjkuYXBwcy5nb29nbGV1c2VyY29udGVudC5jb20iLCJzdWIiOiIxMTAwNTI4ODI2Mzk3MzgxMzY3NzAiLCJlbWFpbF92ZXJpZmllZCI6dHJ1ZSwiYXpwIjoiMzk3MTQxMTW4Nzk3LWhuYm0zY2w0OWJ1b25lY3FhOTgyaWFtZWZsbDVicG45LmFwcHMuZ29vZ2xldXNlcmNvbnRlbnQuY29tIiwiZW1haWwiOiJmYWJsYWI2MXJ1QGdtYWlsLmNvbSJ9.Bs79OBGpLeztzK9ZDNqSSzm6W1pKXT6ojMYRzgtEJFwZJtHgcPNKyEZhFG-sA8ZvZzkKNDYJPZK8nAPLUU6uRKTQUN9mHWzV-JLE5YUv0qCqVulOtVwFPUAp53QR-zJ1Y9CiBAkEUuHoEicc3axZNvYjNdnU8rAesy7a-o5SO-NxswJ9iPosgO2jSPjOHHGVoyQDVAMnB9RURy_LYmdnqVNvmrTJHXVGHmv14eeIYpTHyH2oQvx7dq0kErVTYzkkoYPMS_s7OefCo4phKtgbNfMU5gv0MAQIuebK5xLK1xD8JkORxUYEYPCss9ZVL4iUxKKN36DTqHzCa5mRnhPCiA'
        };
Can't use an undefined value as an ARRAY reference at lib/Google.pm line 53.

Let's create a simple function that will validate bot.pl.json before running bot.

Assigned to myself.