Add Streams.failableStream(T), non-varargs variant

src/changes/changes.xml

@@ -53,6 +53,7 @@ The <action> type attribute can be add,update,fix,remove.
     <action issue="LANG-1724" type="add" dev="ggregory" due-to="Gary Gregory">Add ReflectionDiffBuilder.Builder.</action>
     <action issue="LANG-1724" type="add" dev="ggregory" due-to="Gary Gregory">Add ReflectionDiffBuilder.builder().</action>
     <action issue="LANG-1702" type="add" dev="ggregory" due-to="Elliotte Rusty Harold">Add test in TypeUtilsTest #1151.</action>
+    <action issue="LANG-1724" type="add" dev="ggregory" due-to="Gary Gregory">Add Streams.failableStream(T), non-varargs variant.</action>
     <!-- FIX -->
     <action                   type="fix" dev="ggregory" due-to="Miklós Karakó, Gary Gregory">Improve Javadoc in ExceptionUtils #1136.</action>
     <action                   type="fix" dev="ggregory" due-to="Saiharshith Karuneegar Ramesh, Gary Gregory">Fixed two non-deterministic tests in EnumUtilsTest.java #1131.</action>

src/main/java/org/apache/commons/lang3/stream/Streams.java

@@ -579,6 +579,18 @@ public class Streams {
         return new FailableStream<>(stream);
     }
 
+    /**
+     * Shorthand for {@code Streams.failableStream(value == null ? Stream.empty() : Stream.of(value))}.
+     *
+     * @param <T> the type of stream elements.
+     * @param value the single element of the new stream, may be {@code null}.
+     * @return the new FailableStream on {@code value} or an empty stream.
+     * @since 3.15.0
+     */
+    public static <T> FailableStream<T> failableStream(final T value) {
+        return failableStream(value == null ? Stream.empty() : Stream.of(value));
+    }
+
     /**
      * Shorthand for {@code Streams.failableStream(Streams.of(arrayValues))}.
      *

src/test/java/org/apache/commons/lang3/stream/FailableStreamTest.java

@@ -60,6 +60,10 @@ public class FailableStreamTest {
         return Streams.failableStream(strings).map(this::failable).collect(Collectors.toList()).toArray(new String[0]);
     }
 
+    private String[] toArray(final String string) {
+        return Streams.failableStream(string).map(this::failable).collect(Collectors.toList()).toArray(new String[0]);
+    }
+
     private String[] toArray(final String... strings) {
         return Streams.failableStream(strings).map(this::failable).collect(Collectors.toList()).toArray(new String[0]);
     }