datastore: canonical block 8999999 not found in e3 data storage

[canepat]

Running standalone rpcdaemon at commit 0013a82 using local E3 beta1 data storage, the following RPC integration test fails:

python3 ./run_tests.py --api-list eth_call --run-single-test 1 --dump-response

Runs tests in parallel
0411. http           ::eth_call/test_01.json                                          Failed 
TEST ABORTED!
                                                                                                                  
Test time-elapsed:            0:00:03.398057
Number of executed tests:     1/1156
Number of NOT executed tests: 0
Number of success tests:      0
Number of failed tests:       1

producing the following response diff:

 {
-  result: "0x"
+  error: {
+    code: 100
+    message: "block not found"
+  }
 }

The root cause is canonical block 8999999 not found in DataModel abstraction.