Avoid generating zero size bitmaps

App/Common UI/GradientView.swift

@@ -31,8 +31,9 @@ class GradientView: UIImageView
     }
     
     private func gradientImage(forSize size: CGSize) -> UIImage? {
-        var image: UIImage? = nil
+        guard size != .zero else { return nil }
         
+        var image: UIImage? = nil
         UIGraphicsBeginImageContext(size)
         if let context = UIGraphicsGetCurrentContext() {
             let gradientColorsArray = self.colors.map { $0.cgColor }

App/Titlebar and URL Bar/URLBar.swift

@@ -281,8 +281,9 @@ class URLBar: ReliefButton
     }
     
     private func fadeBackgroundImageForSize(_ size: CGSize, cutoffLocation: CGFloat) -> UIImage? {
-        var image: UIImage? = nil
+        guard size != .zero else { return nil }
         
+        var image: UIImage? = nil
         UIGraphicsBeginImageContext(CGSize(width: size.width, height: 1.0))
         if let context = UIGraphicsGetCurrentContext() {
             let gradientColorsArray = [

App/Web Process Bundle Bridge/SBRScriptPolicy.m

@@ -77,6 +77,10 @@ static CGFloat RoundToScale(CGFloat v, CGFloat s) {
 + (UIImage *)iconRepresentationForPolicyType:(SBRScriptOriginPolicyType)policyType withConfiguration:(nonnull SBRScriptPolicyIconConfiguration *)configuration
 {
     const CGSize size = [configuration size];
+    if (CGSizeEqualToSize(size, CGSizeZero)) {
+        return nil;
+    }
+    
     UIFont *font = [UIFont boldSystemFontOfSize:size.height - 2];
     NSDictionary<NSAttributedStringKey, id> *attrs = @{
         NSFontAttributeName : font,