If environment variables are enabled, but none are added, a NPE is thrown when
saving the config.

Hudson 1.314

java.lang.NullPointerException
at
hudson.slaves.EnvironmentVariablesNodeProperty.toMap(EnvironmentVariablesNodePro
perty.java:105)
at
hudson.slaves.EnvironmentVariablesNodeProperty.(EnvironmentVariablesNodeProperty
.java:55)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorI
mpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorA
ccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:387)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:340)
at hudson.model.Descriptor.newInstance(Descriptor.java:335)
at hudson.util.DescribableList.rebuild(DescribableList.java:236)
at hudson.model.Hudson.doConfigSubmit(Hudson.java:2280)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:176)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:92)
at
org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:53)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:73)
at
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:486)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:404)
at org.kohsuke.stapler.Stapler.service(Stapler.java:117)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
at
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:91)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:155)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at
winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.lang.Thread.run(Thread.java:619)