hardening by avoiding casting

Author: swissspidy

src/Context/FeatureContext.php

@@ -943,7 +943,12 @@ protected static function bootstrap_feature_context(): void {
 			return;
 		}
 
-		$composer = json_decode( (string) file_get_contents( $project_composer ) );
+		$composer_contents = file_get_contents( $project_composer );
+		if ( false === $composer_contents ) {
+			return;
+		}
+
+		$composer = json_decode( $composer_contents );
 		if ( empty( $composer->autoload->files ) ) {
 			return;
 		}