stop replacing the empty string with the number zero in watchers

fixed #473

2 files changed, 10 insertions, 4 deletions

diff --git a/history.txt b/history.txt
index 72a34a6..44160ca 100755
--- a/history.txt
+++ b/history.txt
@@ -2149,3 +2149,7 @@ ______
 * Bug fixes from Nathan, yay, thanks, Nathan!!
 * German translation update
 * Paint Editor transforms, yay, thanks, Kartik!!
+
+140605
+------
+* Objects: stop replacing the empty string with the number zero in watchers
diff --git a/objects.js b/objects.js
index dc02051..e3f1674 100644
--- a/objects.js
+++ b/objects.js
@@ -125,7 +125,7 @@ PrototypeHatBlockMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.objects = '2014-Jun-04';
+modules.objects = '2014-Jun-05';
 
 var SpriteMorph;
 var StageMorph;
@@ -6591,9 +6591,11 @@ WatcherMorph.prototype.update = function () {
         } else {
             newValue = this.target[this.getter]();
         }
-        num = +newValue;
-        if (typeof newValue !== 'boolean' && !isNaN(num)) {
-            newValue = Math.round(newValue * 1000000000) / 1000000000;
+        if (newValue !== '' && !isNil(newValue)) {
+            num = +newValue;
+            if (typeof newValue !== 'boolean' && !isNaN(num)) {
+                newValue = Math.round(newValue * 1000000000) / 1000000000;
+            }
         }
         if (newValue !== this.currentValue) {
             this.changed();