bug #878 Fix parsing docker-composer files with no "version" (CountZero1981)

This PR was merged into the 1.x branch.

Discussion
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Fix parsing docker-composer files with no "version"

Fix #877

Commits
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7639e5f Fix parsing docker-composer files with no "version"

Author: nicolas-grekas

src/Configurator/DockerComposeConfigurator.php

@@ -259,7 +259,7 @@ private function configureDockerCompose(Recipe $recipe, array $config, bool $upd
                 }
 
                 // Keep end in memory (check break line on previous line)
-                $endAt[$node] = '' !== trim($lines[$i - 1]) ? $i : $i - 1;
+                $endAt[$node] = !$i || '' !== trim($lines[$i - 1]) ? $i : $i - 1;
                 $node = $matches[1];
                 if (!isset($nodesLines[$node])) {
                     $nodesLines[$node] = [];