database api separate tests

hivemind/tavern/database_api_negative/find_votes/comment_not_found.pat.json

+{
+  "code": -32003,
+  "data": {
+    "code": 10,
+    "message": "Assert Exception",
+    "name": "assert_exception",
+    "stack": [
+      {
+        "context": {
+          "file": "database_api.cpp",
+          "hostname": "",
+          "level": "error",
+          "line": 1280,
+          "method": "find_votes"
+        },
+        "data": {
+          "a": "",
+          "p": ""
+        },
+        "format": "comment != nullptr: Could not find comment ${a}/${p}"
+      }
+    ]
+  },
+  "message": "Assert Exception:comment != nullptr: Could not find comment /"
+}