The Shell tool threw a NumberFormatException on a empty statement.

h2/src/docsrc/html/changelog.html

@@ -18,7 +18,8 @@ Change Log
 <h1>Change Log</h1>
 
 <h2>Next Version (unreleased)</h2>
-<ul><li>The h2small-*.jar did not support "drop all objects delete files".
+<ul><li>The Shell tool threw a NumberFormatException on a empty statement.
+</li><li>The h2small-*.jar did not support "drop all objects delete files".
     Now it is supported (the DeleteDbFiles tool is now included).
 </li><li>Operations that don't fit in memory are now faster. 
     Temporary file handling was changed.

h2/src/main/org/h2/tools/Shell.java

@@ -317,6 +317,9 @@ public class Shell extends Tool implements Runnable {
     }
 
     private boolean isNumber(String s) {
+        if (s.length() == 0) {
+            return false;
+        }
         for (char c : s.toCharArray()) {
             if (!Character.isDigit(c)) {
                 return false;