ENH: JsonSchemaExporter accepts do_not_create parameter.

Summary

For #116 (closed) Insert a meaningful description for this merge request here: What is the new/changed behavior? Which bug has been fixed? Are there related issues?

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Test Environment

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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• In-code documentation and comments are up-to-date.
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integrationtests/test_cache.py

@@ -64,8 +64,11 @@ class CacheTest(unittest.TestCase):
         update = UpdateCache(db_file=self.cache)
         run_id = "a"
         print(db.execute_query("FIND Record TestRecord", unique=True))
-        print(db.execute_query("FIND Record "+str(rec.id), unique=True))
         print(db.execute_query("FIND entity with id="+str(rec.id), unique=True))
+        try:
+            print(db.execute_query("FIND Record "+str(rec.id), unique=True))
+        except:
+            print("Query does not work as expected")
         update.insert(cont, run_id)
         assert len(update.get_updates(run_id)) == 1