fix: request no reasoning for liveness and handle empty text

tests/test_reasoning_probe.py

@@ -0,0 +1,34 @@
+"""Оба пути пробы запрашивают none и не падают на reasoning-only ответе."""
+import json
+import sqlite3
+
+
+def test_cron_disables_reasoning_and_reports_null_content(core, omni_server):
+    omni_server.set_completions(content=None, reasoning_content="thinking", finish_reason="length",
+                                usage={"prompt_tokens": 12, "completion_tokens": 5, "total_tokens": 17})
+    ok, latency, error, usage = core.probe.check_model("zai/test-model-a")
+    assert ok is False
+    assert error == "Empty text response (finish_reason=length)"
+    assert usage["total_tokens"] == 17
+    request = omni_server.requests[-1]["body"]
+    assert request["reasoning_effort"] == "none"
+    assert request["max_tokens"] == 5
+
+
+def test_manual_disables_reasoning_and_persists_empty_text(core, omni_server):
+    omni_server.set_completions(content=None, reasoning_content="thinking", finish_reason="length",
+                                usage={"prompt_tokens": 12, "completion_tokens": 5, "total_tokens": 17})
+    response = core.client.get("/api/check/zai/test-model-a")
+    assert response.status_code == 200
+    assert response.json()["ok"] is False
+    assert omni_server.requests[-1]["body"]["reasoning_effort"] == "none"
+    db = sqlite3.connect(core.db_path)
+    row = db.execute("SELECT ok,error,total_tokens FROM checks ORDER BY id DESC LIMIT 1").fetchone()
+    db.close()
+    assert row == (0, "Empty text response (finish_reason=length)", 17)
+
+
+def test_text_response_still_succeeds(core, omni_server):
+    omni_server.set_completions(content=" 4 ")
+    assert core.probe.check_model("zai/test-model-a")[0] is True
+    assert core.client.get("/api/check/zai/test-model-a").json()["ok"] is True