cut on empty string returns unexpected result fix #714

Author: jknack

handlebars/src/main/java/com/github/jknack/handlebars/helper/StringHelpers.java

@@ -103,8 +103,15 @@ protected CharSequence safeApply(final Object value, final Options options) {
    * If value is "String with spaces", the output will be "Stringwithspaces".
    */
   cut {
+    @Override public Object apply(Object context, Options options) throws IOException {
+      return safeApply(context, options);
+    }
+
     @Override
     protected CharSequence safeApply(final Object value, final Options options) {
+      if (options.isFalsy(value)) {
+        return "";
+      }
       String strip = options.param(0, " ");
       return value.toString().replace(strip, "");
     }

handlebars/src/test/java/com/github/jknack/handlebars/Issue714.java

@@ -0,0 +1,22 @@
+package com.github.jknack.handlebars;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+import com.github.jknack.handlebars.helper.ConditionalHelpers;
+import com.github.jknack.handlebars.helper.StringHelpers;
+
+public class Issue714 extends v4Test {
+
+  @Override protected void configure(Handlebars handlebars) {
+    handlebars.registerHelpers(StringHelpers.class);
+  }
+
+  @Test
+  public void shouldIgnoreEmptyString() throws IOException {
+    shouldCompileTo("{{cut value \"-\"}}", $("hash", $("value", "")), "");
+
+    shouldCompileTo("{{cut value \"-\"}}", $("hash", $("value", "2019-12-30")), "20191230");
+  }
+}