Skip category check for unknown ODBC errors in "Reconnect" test

At least PostgreSQL ODBC driver just returns "HY000", i.e. "General
error" in case of connection loss, which clearly can't be always mapped
to soci_error::connection_error, so we need to take into account that
get_error_category() doesn't always return the expected value, at least
with the ODBC backend.

tests/common-tests.h

@@ -4667,8 +4667,17 @@ TEST_CASE_METHOD(common_tests, "Reconnect", "[keep-alive][.]")
     }
     catch (soci_error const& e)
     {
-        INFO( "Exception message: " << e.what() );
-        CHECK( e.get_error_category() == soci_error::connection_error );
+        if ( sql.get_backend_name() == "odbc" ||
+                e.get_error_category() == soci_error::unknown )
+        {
+            WARN( "Skipping error check because ODBC driver returned "
+                  "unknown error: " << e.what() );
+        }
+        else
+        {
+            INFO( "Exception message: " << e.what() );
+            CHECK( e.get_error_category() == soci_error::connection_error );
+        }
     }
 
     std::cout << "Please undo the previous action "