Feature/con 519 api requests auditing (#831)

* early return if no response body

* capitalization touchup

Author: tw2113

includes/class-api.php

@@ -1614,11 +1614,16 @@ private function exec( $url, $options ): bool {
 		$this->status_code = 0;
 
 		if ( ! is_wp_error( $response ) ) {
-
+			if ( empty( $response['body'] ) ) {
+				constant_contact_maybe_log_it(
+					'Response error: ', implode( ":", $response['response'] )
+				);
+				return false;
+			}
 			$data            = json_decode( $response['body'], true );
 			$json_last_error = json_last_error();
 			if ( JSON_ERROR_NONE !== $json_last_error ) {
-				constant_contact_maybe_log_it( 'JSON Error: ', json_last_error_msg() );
+				constant_contact_maybe_log_it( 'JSON error: ', json_last_error_msg() );
 			}
 
 			// check if the body contains error