Plugin: Fix warnings trying to delete unexisting icons of previously installed plugins

plugin/bbb/lib/bbb_plugin.class.php

@@ -360,7 +360,9 @@ class BBBPlugin extends Plugin
             $destinationDir = api_get_path(SYS_CODE_PATH).'img/icons/';
             foreach ($iconsList as $icon) {
                 $dest = $destinationDir.$icon;
-                unlink($dest);
+                if (is_file($dest)) {
+                    @unlink($dest);
+                }
             }
         }
     }

plugin/google_meet/src/google_meet_plugin.class.php

@@ -146,7 +146,9 @@ class GoogleMeetPlugin extends Plugin
         $destinationDir = api_get_path(SYS_CODE_PATH).'img/icons/';
         foreach ($iconsList as $icon) {
             $dest = $destinationDir.$icon;
-            unlink($dest);
+            if (is_file($dest)) {
+                @unlink($dest);
+            }
         }
     }
 

plugin/mindmap/mindmap_plugin.class.php

@@ -100,7 +100,9 @@ class MindmapPlugin extends Plugin
         $destinationDir = api_get_path(SYS_CODE_PATH).'img/icons/';
         foreach ($iconsList as $icon) {
             $dest = $destinationDir.$icon;
-            unlink($dest);
+            if (is_file($dest)) {
+                @unlink($dest);
+            }
         }
 
         // Deleting course settings and course home icons

plugin/zoom/lib/ZoomPlugin.php

@@ -222,7 +222,7 @@ class ZoomPlugin extends Plugin
             $dest = $destinationDir.$icon;
             copy($src, $dest);
         }
-        
+
         $this->install_course_fields_in_all_courses(true, 'zoom_meet.png');
     }
 
@@ -255,7 +255,9 @@ class ZoomPlugin extends Plugin
         $destinationDir = api_get_path(SYS_CODE_PATH).'img/icons/';
         foreach ($iconsList as $icon) {
             $dest = $destinationDir.$icon;
-            unlink($dest);
+            if (is_file($dest)) {
+                @unlink($dest);
+            }
         }
 
     }