bug #4633 Fix ExtensionSet usage of BinaryOperatorExpressionParser (VincentLanglet)

This PR was squashed before being merged into the 3.x branch.

Discussion
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Fix ExtensionSet usage of BinaryOperatorExpressionParser

This fix both issue of #4632

Commits
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e14a247 Fix warning
00d29e6 Fix instantiation

Author: fabpot

src/ExtensionSet.php

@@ -507,10 +507,10 @@ private function initExtension(ExtensionInterface $extension): void
                 default => throw new \InvalidArgumentException(\sprintf('Invalid associativity "%s" for operator "%s".', $op['associativity'], $operator)),
             };
 
-            if ($op['callable']) {
+            if (isset($op['callable'])) {
                 $expressionParsers[] = $this->convertInfixExpressionParser($op['class'], $operator, $op['precedence'], $op['associativity'], $op['precedence_change'] ?? null, $op['aliases'] ?? [], $op['callable']);
             } else {
-                $expressionParsers[] = new BinaryOperatorExpressionParser($op['class'], $operator, $op['precedence'], $op['associativity'], $op['precedence_change'] ?? null, $op['aliases'] ?? []);
+                $expressionParsers[] = new BinaryOperatorExpressionParser($op['class'], $operator, $op['precedence'], $op['associativity'], $op['precedence_change'] ?? null, '', $op['aliases'] ?? []);
             }
         }