fix(error-handling): Throw errors that do not have a response body

These errors occur for connection / request setup problems (i.e. if
there is not internet connection)

Author: landakram

lib/Instant2FA.php

@@ -18,6 +18,7 @@
 use Instant2FA\Serializer\VerificationRequestSerializer;
 use Instant2FA\Serializer\VerificationResponseSerializer;
 
+use Instant2FA\Error\Instant2FAException;
 use Instant2FA\Error\APIException;
 use Instant2FA\Error\MFANotEnabled;
 use Instant2FA\Error\VerificationFailedException;
@@ -80,6 +81,8 @@ public function create_settings($distinct_id) {
                 $error_body = $response->getBody();
                 $doc = $this->decoder->decode($error_body);
                 throw new APIException($doc->errors);
+            } else {
+                throw new Instant2FAException($e->getMessage());
             }
         }
 
@@ -110,6 +113,8 @@ public function create_verification($distinct_id) {
                 $error_body = $response->getBody();
                 $doc = $this->decoder->decode($error_body);
                 throw new APIException($doc->errors);
+            } else {
+                throw new Instant2FAException($e->getMessage());
             }
         }
         $body = $response->getBody();
@@ -144,6 +149,8 @@ public function confirm_verification($distinct_id, $token) {
                 $error_body = $response->getBody();
                 $doc = $this->decoder->decode($error_body);
                 throw new APIException($doc->errors);
+            } else {
+                throw new Instant2FAException($e->getMessage());
             }
         }
         $body = $response->getBody();