Catch missing data #52
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Take into account that $line_item['resourceId'] and $line_item['tag'] are optional
deep_link_settings['data'] might be empty. It is only required if present in LtiDeepLinkingRequest message: https://www.imsglobal.org/spec/lti-dl/v2p0#data
Use $request['target_link_uri'] as the fall-back redirect_uri.
Return new static instead of new LTI_Message_Launch so that the class can be extended. Throw exception when nonce does not check out. Remove var_dump() statement.
Return new static instead of new LTI_Deep_Link_Resource to make it easier to extend the class. Include all line_item attributes in new deep link resource, not just scoreMaximum and label.
Offer default for missing $lineitem["startDateTime"] and $lineitem["endDateTime"]. Return new static instead of new LTI_Lineitem to make it easier to extend the class. Decompose __toString() into two functions: to_array() and __toString()
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These changes catch missing data, and make some classes more extendable.