fixing bug related to date that occurred after migration to github

date is taken from a property file as a value that is updated by svn.
after migration, the value is not updated.
I bypassed the bug but we have to fix it in a better way.
Signed-off-by: Amr <amr_alhossary@hotmail.com>

src/org/jmol/viewer/JC.java

@@ -167,6 +167,9 @@ public static String getMacro(String key) {
         }
       }
     }
+    if(tmpDate!= null && tmpDate.length() < 23) {
+      tmpDate=null;
+    }
     if (tmpDate != null) {
       tmpDate = tmpDate.substring(7, 23);
       // NOTE : date is updated in the properties by SVN, and is in the format