Attempt to reproduce and fix pr3350. The reproducer did not hit the issue, so only DID NPE check was done * netx/net/sourceforge/jnlp/security/SecurityDialogs.java: (showMatchingALACAttributePanel) defensive NPE check for codebase * netx/net/sourceforge/jnlp/util/UrlUtils.java: (setOfUrlsToHtmlList) defensive NPE check * tests/reproducers/signed/Kemtrakpro/resources/Kemtrak.jnlp: exact jnlp from pr3350 bug report * tests/reproducers/signed/Kemtrakpro/srcs/Kemtrak.java: dummy main jar * tests/reproducers/signed/Kemtrakpro/srcs/META-INF/MANIFEST.MF: exact manifest from pr3350 * tests/reproducers/signed/jcalendar/srcs/jcalendar.java: dummy dependence of Kemtrak * tests/reproducers/signed/Kemtrakpro/testcases/KemtrakTests.java: simple launch of jnlp

[Desktop Entry]
Name=IcedTea-Web Policy Editor
GenericName=Policy Tool 
Comment=Edit Java Applet policy and permission settings
Exec=PATH_TO_POLICYEDITOR
Icon=javaws
Terminal=false
Type=Application
Categories=Settings;
Keywords=IcedTea;IcedTea-Web;java;javaws;web;start;webstart;jnlp;