Only check for existence of validators when trying to find them

This allows a bit of cleanup on some components which are always
checking for has_validators? before doing the validators lookup.

lib/simple_form/components/maxlength.rb

@@ -11,7 +11,7 @@ module SimpleForm
 
       def maximum_length_from_validation
         if options[:maxlength] == true
-          if has_validators? && (length_validator = find_length_validator)
+          if length_validator = find_length_validator
             length_validator.options[:maximum]
           end
         else

lib/simple_form/components/min_max.rb

@@ -2,8 +2,6 @@ module SimpleForm
   module Components
     module MinMax
       def min_max
-        return unless has_validators?
-
         if numeric_validator = find_numericality_validator
           validator_options = numeric_validator.options
           input_html_options[:min] ||= minimum_value(validator_options)
@@ -48,4 +46,4 @@ module SimpleForm
       end
     end
   end
-end
+end

lib/simple_form/components/pattern.rb

@@ -11,7 +11,7 @@ module SimpleForm
 
       def pattern_source
         if options[:pattern] == true
-          if has_validators? && (pattern_validator = find_pattern_validator)
+          if pattern_validator = find_pattern_validator
             pattern_validator.options[:with].source
           end
         else

lib/simple_form/helpers/validators.rb

@@ -37,7 +37,7 @@ module SimpleForm
       end
 
       def find_validator(validator)
-        attribute_validators.find { |v| validator === v }
+        attribute_validators.find { |v| validator === v } if has_validators?
       end
     end
   end