(maint) Add additional rubocop exceptions

This commit adds the following exceptions:

- Style/EmptyMethod
  Methods which are empty are typically supposed to not spread over two lines
  however this is a matter of readability and should not be considered a
  violation
- Metrics/BlockNesting
  Due to a legacy codebase there are instances where the block depth is quite
  high.  Ignore these violations for the time being.

.rubocop.yml

@@ -17,6 +17,9 @@ Style/Documentation:
 Metrics/LineLength:
   Enabled: false
 
+# Empty method definitions over more than one line is ok
+Style/EmptyMethod:
+  Enabled: false
 
 # Due to legacy codebase
 #   - Globals are used liberally
@@ -29,6 +32,8 @@ Metrics/PerceivedComplexity:
   Enabled: false
 Metrics/CyclomaticComplexity:
   Enabled: false
+Metrics/BlockNesting:
+  Enabled: false
 #   - Long Methods, Classes, Blocks, and Modules
 Metrics/MethodLength:
   Enabled: false