Design defects fix

MVMCoreUI/BaseControllers/ThreeLayerTableViewController.swift

@@ -214,14 +214,16 @@ open class ThreeLayerTableViewController: MFProgrammaticTableViewController {
     /// Subclass for a top view.
     open func viewForTop() -> UIView {
         let view = MVMCoreUICommonViewsUtility.commonView()
-        view.heightAnchor.constraint(equalToConstant: 0).isActive = true
+        // Small height is needed to stop apple from adding padding for grouped tables when no header.
+        view.heightAnchor.constraint(equalToConstant: 1).isActive = true
         return view
     }
         
     /// Subclass for a bottom view.
     open func viewForBottom() -> UIView {
+        // Default spacing is standard when no buttons.
         let view = MVMCoreUICommonViewsUtility.commonView()
-        view.heightAnchor.constraint(equalToConstant: 0).isActive = true
+        view.heightAnchor.constraint(equalToConstant: PaddingDefaultVerticalSpacing).isActive = true
         return view
     }
     

MVMCoreUI/Utility/MVMCoreUICommonViewsUtility.m

@@ -33,6 +33,7 @@ static const CGFloat VertialShadowOffset = 6;
     UIView *view = [[UIView alloc] initWithFrame:CGRectZero];
     view.translatesAutoresizingMaskIntoConstraints = NO;
     view.backgroundColor = [UIColor clearColor];
+    view.directionalLayoutMargins = NSDirectionalEdgeInsetsZero;
     return view;
 }