java: use missing

Author: scivision

+stdlib/java_home.m

@@ -3,11 +3,9 @@
 function h = java_home()
 
 try
-  h = javaMethod('getProperty', 'java.lang.System', 'java.home');
+  h = char(javaMethod('getProperty', 'java.lang.System', 'java.home'));
 catch
-  h = '';
+  h = missing;
 end
 
-h = char(h);
-
 end

+stdlib/java_version.m

@@ -10,11 +10,9 @@
 function v = java_version()
 
 try
-  v = javaMethod('getProperty', 'java.lang.System', 'java.version');
+  v = char(javaMethod('getProperty', 'java.lang.System', 'java.version'));
 catch
-  v = '';
+  v = missing;
 end
 
-v = char(v);
-
 end