Prevent empty tooltips from appearing (#14015)

Change-Id: Iee9d5be9208ff54cd0e4a58c19daaa3a917f9b9d

2 files changed, 4 insertions, 11 deletions

diff --git a/client/src/com/vaadin/client/VTooltip.java b/client/src/com/vaadin/client/VTooltip.java
index 1385a52469..4db4477caa 100644
--- a/client/src/com/vaadin/client/VTooltip.java
+++ b/client/src/com/vaadin/client/VTooltip.java
@@ -109,13 +109,13 @@ public class VTooltip extends VWindowOverlay {
     }
 
     private void setTooltipText(TooltipInfo info) {
-        if (info.getErrorMessage() != null) {
+        if (info.getErrorMessage() != null && !info.getErrorMessage().isEmpty()) {
             em.setVisible(true);
             em.updateMessage(info.getErrorMessage());
         } else {
             em.setVisible(false);
         }
-        if (info.getTitle() != null && !"".equals(info.getTitle())) {
+        if (info.getTitle() != null && !info.getTitle().isEmpty()) {
             description.setInnerHTML(info.getTitle());
             description.getStyle().clearDisplay();
         } else {
@@ -130,13 +130,7 @@ public class VTooltip extends VWindowOverlay {
      * 
      */
     private void showTooltip() {
-        boolean hasContent = false;
-        if (currentTooltipInfo.getErrorMessage() != null
-                || (currentTooltipInfo.getTitle() != null && !""
-                        .equals(currentTooltipInfo.getTitle()))) {
-            hasContent = true;
-        }
-        if (hasContent) {
+        if (currentTooltipInfo.hasMessage()) {
             // Issue #8454: With IE7 the tooltips size is calculated based on
             // the last tooltip's position, causing problems if the last one was
             // in the right or bottom edge. For this reason the tooltip is moved
@@ -491,7 +485,6 @@ public class VTooltip extends VWindowOverlay {
             handledByFocus = isFocused;
             currentElement = element;
         }
-
     }
 
     private final TooltipEventHandler tooltipEventHandler = new TooltipEventHandler();
diff --git a/server/src/com/vaadin/server/AbstractErrorMessage.java b/server/src/com/vaadin/server/AbstractErrorMessage.java
index c733cc493e..b56521993a 100644
--- a/server/src/com/vaadin/server/AbstractErrorMessage.java
+++ b/server/src/com/vaadin/server/AbstractErrorMessage.java
@@ -126,7 +126,7 @@ public abstract class AbstractErrorMessage implements ErrorMessage {
             StringBuilder sb = new StringBuilder();
             for (ErrorMessage cause : getCauses()) {
                 String childMessage = cause.getFormattedHtmlMessage();
-                if (null != childMessage) {
+                if (null != childMessage && !childMessage.isEmpty()) {
                     sb.append("<div>");
                     sb.append(childMessage);
                     sb.append("</div>\n");