SERVER-90727 Fixes analyze_shard_key.js test to ignore missing sample…

…d docs (#22418)

GitOrigin-RevId: e8d9c990d4a98e6397fc8199942efa4e0d006329

jstests/concurrency/fsm_workloads/analyze_shard_key.js

@@ -697,6 +697,14 @@ export const $config = extendWorkload(kBaseConfig, function($config, $super) {
             // Inaccurate fast count is only expected when there is unclean shutdown.
             return TestData.runningWithShardStepdowns;
         }
+        // TODO SERVER-91030: Remove special handling of error code 7826507.
+        if (err.code == 7826507) {
+            print(
+                `Failed to analyze the shard key because the number of sampled documents is zero. ${
+                    tojsononeline(err)}`);
+            // This may be due to chunk migrations.
+            return true;
+        }
         if (err.code == ErrorCodes.IllegalOperation && err.errmsg &&
             err.errmsg.includes("monotonicity") && err.errmsg.includes("empty collection")) {
             print(`Failed to analyze the shard key because the fast count during the ` +