PDF generation issue

[laffer1]

When generating a PDF, if the user has no blog entries or the security prohibits fetching the data (e.g. public request), an NPE is thrown due to no pages.

java.lang.NullPointerException: null
at java.base/java.lang.AbstractStringBuilder.(AbstractStringBuilder.java:104) ~[na:na]
at java.base/java.lang.StringBuffer.(StringBuffer.java:151) ~[na:na]
at com.lowagie.text.Chunk.(Chunk.java:151) ~[openpdf-1.3.27.jar!/:na]
at com.lowagie.text.Chunk.(Chunk.java:163) ~[openpdf-1.3.27.jar!/:na]
at com.justjournal.services.AbstractFormatService.format(AbstractFormatService.java:72) ~[classes!/:3.0.0]
at com.justjournal.services.PdfFormatService.write(PdfFormatService.java:50) ~[classes!/:3.0.0]
at com.justjournal.ctl.UsersController.getPDF(UsersController.java:833) ~[classes!/:3.0.0]
at com.justjournal.ctl.UsersController.pdf(UsersController.java:596) ~[classes!/:3.0.0]
at com.justjournal.ctl.UsersController$$FastClassBySpringCGLIB$$6be2e7c1.invoke() ~[classes!/:3.0.0]
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.13.jar!/:5.3.13]