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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• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
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unittests/test_json_schema_exporter.py

@@ -279,6 +279,7 @@ def test_rt_with_references():
     rt.add_property(name="RefProp", datatype=db.REFERENCE)
 
     schema = rtjs(rt)
+    props = schema["properties"]
 
     rt = db.RecordType()
     rt.add_property(name="RefProp", datatype="OtherType")
@@ -295,6 +296,18 @@ def test_rt_with_references():
 
     schema = rtjs(rt)
 
+    rt = db.RecordType()
+    rt.add_property(name="FileProp", datatype=db.FILE)
+
+    with raises(NotImplementedError):
+        schema = rtjs(rt)
+
+    rt = db.RecordType()
+    rt.add_property(name="FileProp", datatype=db.LIST(db.FILE))
+
+    with raises(NotImplementedError):
+        schema = rtjs(rt)
+
 
 def test_broken():