WebHost: restore old silent ignore of mimetypes in json getting (#1292)

* WebHost: restore old silent ignore of mimetypes in json getting of /api/generate

* Tests: add tests for /api/generate

test/webhost/TestAPIGenerate.py

@@ -0,0 +1,40 @@
+import unittest
+import json
+
+
+class TestDocs(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        from WebHost import get_app, raw_app
+        raw_app.config["PONY"] = {
+            "provider": "sqlite",
+            "filename": ":memory:",
+            "create_db": True,
+        }
+        app = get_app()
+        app.config.update({
+            "TESTING": True,
+        })
+        cls.client = app.test_client()
+
+    def testCorrectErrorEmptyRequest(self):
+        response = self.client.post("/api/generate")
+        self.assertIn("No options found. Expected file attachment or json weights.", response.text)
+
+    def testGenerationQueued(self):
+        options = {
+            "Tester1":
+                {
+                    "game": "Archipelago",
+                    "name": "Tester",
+                    "Archipelago": {}
+                }
+        }
+        response = self.client.post(
+            "/api/generate",
+            data=json.dumps({"weights": options}),
+            content_type='application/json'
+        )
+        json_data = response.get_json()
+        self.assertTrue(json_data["text"].startswith("Generation of seed "))
+        self.assertTrue(json_data["text"].endswith(" started successfully."))