rspec/rules/S126/plsql/rule.adoc

This rule applies whenever an `+IF+` statement is followed by one or 
more `+ELSEIF+` statements; the final `+ELSEIF+` should be followed by an `+ELSE+` statement.

The requirement for a final `+ELSE+` statement is defensive programming. 
The `+ELSE+` statement should either take appropriate action or contain 
a suitable comment as to why no action is taken. This is consistent with the 
requirement to have a final `+ELSE+` clause in a `+CASE+`
statement. 

== Noncompliant Code Example

----
IF my_variable = 0 THEN
  do_something;
ELSIF my_variable = 1 THEN
  do_something_else;
END IF;
----

== Compliant Solution

----
IF my_variable = 0 THEN
  do_something;
ELSIF my_variable = 1 THEN
  do_something_else;
ELSE
  -- Nothing has to be done.
  NULL;
END IF;
----

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