fix: improve pipemap option

https://github.com/plantuml/plantuml/issues/1429

gradle.properties

@@ -1,4 +1,4 @@
 # Warning, "version" should be the same in gradle.properties and Version.java
 # Any idea anyone how to magically synchronize those :-) ?
-version = 1.2023.8
+version = 1.2023.9beta1
 org.gradle.workers.max = 3

src/net/sourceforge/plantuml/Pipe.java

@@ -53,6 +53,7 @@ import net.sourceforge.plantuml.core.DiagramDescription;
 import net.sourceforge.plantuml.error.PSystemError;
 import net.sourceforge.plantuml.preproc.Defines;
 import net.sourceforge.plantuml.security.SFile;
+import net.sourceforge.plantuml.url.CMapData;
 
 public class Pipe {
 	// ::remove file when __CORE__
@@ -124,9 +125,10 @@ public class Pipe {
 		// https://forum.plantuml.net/10049/2019-pipemap-diagrams-containing-links-give-zero-exit-code
 		// We don't check errors
 		error.goOk();
-		if (result == null)
-			ps.println();
-		else
+		if (result == null) {
+			final CMapData empty = new CMapData();
+			ps.println(empty.asString("plantuml"));
+		} else
 			ps.println(result);
 
 	}

src/net/sourceforge/plantuml/timingdiagram/command/TimeTickBuilder.java

@@ -50,7 +50,7 @@ public class TimeTickBuilder {
 
 	public static IRegex expressionAtWithoutArobase(String name) {
 		return new RegexOr( //
-				new RegexLeaf(name + "CODE", ":([%pLN_.]+)([-+]\\d+)?"), //
+				new RegexLeaf(name + "CODE", ":([%pLN_.]+)([-+][.\\d]+)?"), //
 				new RegexLeaf(name + "DATE", "(\\d+)/(\\d+)/(\\d+)"), //
 				new RegexLeaf(name + "HOUR", "(\\d+):(\\d+):(\\d+)"), //
 				new RegexLeaf(name + "DIGIT", "(\\+?)(-?\\d+\\.?\\d*)"), //

src/net/sourceforge/plantuml/version/Version.java

@@ -46,7 +46,7 @@ public class Version {
 
 	// Warning, "version" should be the same in gradle.properties and Version.java
 	// Any idea anyone how to magically synchronize those :-) ?
-	private static final String version = "1.2023.8";
+	private static final String version = "1.2023.9beta1";
 
 	public static String versionString() {
 		return version;