chore: remove occurrences of empty() (#374)

`empty()` is used less and less in favor of bool casts on arrays.
Symfony, for example, banned it from its codebase. I suggest we remove
them from here as well.

Author: alexandre-daubois

src/Bridge/Anthropic/Contract/AssistantMessageNormalizer.php

@@ -58,7 +58,7 @@ public function normalize(mixed $data, ?string $format = null, array $context =
                     'type' => 'tool_use',
                     'id' => $toolCall->id,
                     'name' => $toolCall->name,
-                    'input' => empty($toolCall->arguments) ? new \stdClass() : $toolCall->arguments,
+                    'input' => 0 !== \count($toolCall->arguments) ? $toolCall->arguments : new \stdClass(),
                 ];
             }, $data->toolCalls),
         ];

src/Bridge/Anthropic/ResponseConverter.php

@@ -57,7 +57,7 @@ public function convert(ResponseInterface $response, array $options = []): LlmRe
             throw new RuntimeException('Response content does not contain any text nor tool calls.');
         }
 
-        if (!empty($toolCalls)) {
+        if (0 !== \count($toolCalls)) {
             return new ToolCallResponse(...$toolCalls);
         }
 

src/Bridge/Bedrock/Anthropic/ClaudeHandler.php

@@ -80,7 +80,7 @@ public function convert(InvokeModelResponse $bedrockResponse): LlmResponse
                 $toolCalls[] = new ToolCall($content['id'], $content['name'], $content['input']);
             }
         }
-        if (!empty($toolCalls)) {
+        if (0 !== \count($toolCalls)) {
             return new ToolCallResponse(...$toolCalls);
         }
 

src/Bridge/Bedrock/Nova/Contract/AssistantMessageNormalizer.php

@@ -57,7 +57,7 @@ public function normalize(mixed $data, ?string $format = null, array $context =
                         'toolUse' => [
                             'toolUseId' => $toolCall->id,
                             'name' => $toolCall->name,
-                            'input' => empty($toolCall->arguments) ? new \stdClass() : $toolCall->arguments,
+                            'input' => 0 !== \count($toolCall->arguments) ? $toolCall->arguments : new \stdClass(),
                         ],
                     ];
                 }, $data->toolCalls),

src/Bridge/Bedrock/Nova/NovaHandler.php

@@ -81,7 +81,7 @@ public function convert(InvokeModelResponse $bedrockResponse): LlmResponse
                 $toolCalls[] = new ToolCall($content['toolUse']['toolUseId'], $content['toolUse']['name'], $content['toolUse']['input']);
             }
         }
-        if (!empty($toolCalls)) {
+        if (0 !== \count($toolCalls)) {
             return new ToolCallResponse(...$toolCalls);
         }