Fixed ci/script.sh to run tests when desired.

Author: berkowski

ci/script.sh

@@ -7,7 +7,7 @@ main() {
     cross build --target $TARGET
     cross build --target $TARGET --release
 
-    if [ -n $DISABLE_TESTS ]; then
+    if [ ! -z $DISABLE_TESTS ]; then
         return
     fi