Fix for null pointer exception in safe area

Fixed #3764

Author: shai-almog

Ports/iOSPort/nativeSources/IOSNative.m

@@ -8286,37 +8286,41 @@ JAVA_BOOLEAN com_codename1_impl_ios_IOSNative_nativeIsAlphaMaskSupportedGlobal__
 JAVA_INT com_codename1_impl_ios_IOSNative_getDisplaySafeInsetLeft___R_int(CN1_THREAD_STATE_MULTI_ARG JAVA_OBJECT instanceObject) {
     if (@available(iOS 11.0, *)) {
         UIWindow *window = UIApplication.sharedApplication.keyWindow;
-        return (JAVA_INT)(window.safeAreaInsets.left * scaleValue);
-    } else {
-        return 0;
+        if(window != nil && window.safeAreaInsets != nil) {
+            return (JAVA_INT)(window.safeAreaInsets.left * scaleValue);
+        }
     }
+    return 0;
 }
 
 JAVA_INT com_codename1_impl_ios_IOSNative_getDisplaySafeInsetTop___R_int(CN1_THREAD_STATE_MULTI_ARG JAVA_OBJECT instanceObject) {
     if (@available(iOS 11.0, *)) {
         UIWindow *window = UIApplication.sharedApplication.keyWindow;
-        return (JAVA_INT)(window.safeAreaInsets.top * scaleValue);
-    } else {
-        return 0;
+        if(window != nil && window.safeAreaInsets != nil) {
+            return (JAVA_INT)(window.safeAreaInsets.top * scaleValue);
+        }
     }
+    return 0;
 }
 
 JAVA_INT com_codename1_impl_ios_IOSNative_getDisplaySafeInsetRight___R_int(CN1_THREAD_STATE_MULTI_ARG JAVA_OBJECT instanceObject) {
     if (@available(iOS 11.0, *)) {
         UIWindow *window = UIApplication.sharedApplication.keyWindow;
-        return (JAVA_INT)(window.safeAreaInsets.right * scaleValue);
-    } else {
-        return 0;
+        if(window != nil && window.safeAreaInsets != nil) {
+            return (JAVA_INT)(window.safeAreaInsets.right * scaleValue);
+        }
     }
+    return 0;
 }
 
 JAVA_INT com_codename1_impl_ios_IOSNative_getDisplaySafeInsetBottom___R_int(CN1_THREAD_STATE_MULTI_ARG JAVA_OBJECT instanceObject) {
     if (@available(iOS 11.0, *)) {
         UIWindow *window = UIApplication.sharedApplication.keyWindow;
-        return (JAVA_INT)(window.safeAreaInsets.bottom * scaleValue);
-    } else {
-        return 0;
+        if(window != nil && window.safeAreaInsets != nil) {
+            return (JAVA_INT)(window.safeAreaInsets.bottom * scaleValue);
+        }
     }
+    return 0;
 }
 
 JAVA_INT com_codename1_impl_ios_IOSNative_getDisplayWidth___R_int(CN1_THREAD_STATE_MULTI_ARG JAVA_OBJECT instanceObject) {