Handlebars syntax errors fail silently when creating ApiModel.java

[ms14981]

If there is a syntax error in the partials/model.Handlebars or in ApiModel.Handlebars, then the generation will still look successful but no ApiModel.java file will be created:

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            API generation  SUCCESSFUL

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 Your API has been forged from the fiery furnace:
 8 models have been molded
 13 endpoints have been cast

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