don't crash when removing a nonexistent package

tools/commands-packages.js

@@ -1757,12 +1757,9 @@ main.registerCommand({
   maxArgs: Infinity,
   requiresApp: true
 }, function (options) {
-  // Refresh the catalog, checking the remote package data on the
-  // server. Technically, we don't need to do this, since it is unlikely that
-  // new data will change our constraint solver decisions. But as a user, I
-  // would expect this command to update the local catalog.
-  // XXX what if we're offline?
-  refreshOfficialCatalogOrDie();
+  // As user may expect this to update the catalog, but we con't actually need
+  // to, and it takes frustratingly long.
+  // refreshOfficialCatalogOrDie();
 
   // Read in existing package dependencies.
   var packages = project.getConstraints();
@@ -1786,8 +1783,9 @@ main.registerCommand({
 
   var messages = buildmessage.capture(function () {
     // Get the contents of our versions file, we will want them in order to
-    // remove to the user what we removed.
-    var versions = project.getVersions();
+    // remove to the user what we removed. Note that we are actually just getting
+    // getting the versions file, not running the constraint solver.
+    var versions = project.dependencies;
 
     // Remove the packages from the project! There is really no way for this to
     // fail, unless something has gone horribly wrong, so we don't need to check