Add a getNonEmptyValue() method to LanguagesPageFieldValue class and make use of it in ProcessPageEdit to avoid situations where headline was otherwise blank

wire/modules/LanguageSupport/LanguagesPageFieldValue.php

@@ -3,7 +3,7 @@
 /**
  * Serves as a multi-language value placeholder for field values that contain a value in more than one language. 
  *
- * ProcessWire 3.x, Copyright 2016 by Ryan Cramer
+ * ProcessWire 3.x, Copyright 2019 by Ryan Cramer
  * https://processwire.com
  *
  */
@@ -191,6 +191,32 @@ class LanguagesPageFieldValue extends Wire implements LanguagesValueInterface, \
 		return $this->data[$this->defaultLanguagePageID];
 	}
 
+	/**
+	 * Get non-empty value in this order: current lang, default lang, other lang, failValue
+	 * 
+	 * @param string $failValue Value to use if we cannot find a non-empty value
+	 * @return string 
+	 * @since 3.0.147
+	 * 
+	 */
+	public function getNonEmptyValue($failValue = '') {
+		
+		$value = (string) $this;
+		if(strlen($value)) return $value; 
+		
+		$value = (string) $this->getDefaultValue();
+		if(strlen($value)) return $value;
+		
+		foreach($this->wire('languages') as $language) {
+			$value = $this->getLanguageValue($language->id);
+			if(strlen($value)) break;
+		}
+		
+		if(!strlen($value)) $value = $failValue;
+		
+		return $value;
+	}
+
 	/**
 	 * The string value is the value in the current user's language
 	 *
@@ -245,7 +271,7 @@ class LanguagesPageFieldValue extends Wire implements LanguagesValueInterface, \
 	 *
 	 * Fulfills \IteratorAggregate interface.
 	 *
-	 * @return ArrayObject
+	 * @return \ArrayObject
 	 *
 	 */
 	public function getIterator() {

wire/modules/Process/ProcessPageEdit/ProcessPageEdit.module

@@ -2984,10 +2984,16 @@ class ProcessPageEdit extends Process implements WirePageEditor, ConfigurableMod
 	public function setupHeadline() {
 
 		$titlePage = null;
+		$page = $this->page;
 		
-		if($this->page && $this->page->id) {
+		if($page && $page->id) {
-			$page = $this->page;
 			$title = $page->get('title');
+			if(is_object($title) && !strlen("$title") && wireInstanceOf($title, 'LanguagesPageFieldValue')) {
+				/** @var LanguagesPageFieldValue $title */
+				$title = $title->getNonEmptyValue($page->name);
+			} else {
+				$title = (string) $title;
+			}
 			if(empty($title)) {
 				if($this->wire('pages')->names()->isUntitledPageName($page->name)) {
 					$title = $page->template->getLabel();
@@ -2995,6 +3001,7 @@ class ProcessPageEdit extends Process implements WirePageEditor, ConfigurableMod
 					$title = $page->get('name');
 				}
 			}
+			if(empty($title)) $title = $page->name;
 		} else if($this->parent && $this->parent->id) {
 			$titlePage = $this->parent;
 			$title = rtrim($this->parent->path, '/') . '/[...]';
@@ -3004,6 +3011,7 @@ class ProcessPageEdit extends Process implements WirePageEditor, ConfigurableMod
 		}
 
 		$browserTitle = sprintf($this->_('Edit Page: %s'), $title);
+		$headline = '';
 
 		if($this->field) {
 			if(count($this->fields) == 1) {
@@ -3019,11 +3027,10 @@ class ProcessPageEdit extends Process implements WirePageEditor, ConfigurableMod
 			
 		} else if($titlePage) {
 			$headline = $titlePage->get('title|name');
-			
-		} else {
-			$headline = $title;
 		}
 	
+		if(empty($headline)) $headline = $title;
+
 		$this->headline($headline);
 		$this->browserTitle($browserTitle);
 	}