Implement suggestions from code review

Author: rodrigoprimo

src/Standards/Generic/Sniffs/CodeAnalysis/EmptyPHPStatementSniff.php

@@ -124,9 +124,8 @@ public function process(File $phpcsFile, $stackPtr)
         case 'T_CLOSE_TAG':
             $prevNonEmpty = $phpcsFile->findPrevious(T_WHITESPACE, ($stackPtr - 1), null, true);
 
-            if ($prevNonEmpty === false
-                || ($tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG
-                && $tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG_WITH_ECHO)
+            if ($tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG
+                && $tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG_WITH_ECHO
             ) {
                 return;
             }

src/Standards/Generic/Tests/CodeAnalysis/EmptyPHPStatementUnitTest.2.inc

@@ -1,4 +1,4 @@
-<!-- Tests with short open echo tag. -->
+<!-- Tests with short open tag. -->
 
 <input name="<? ; something_else(); ?>" />
 <input name="<? something_else(); ; ?>" />

src/Standards/Generic/Tests/CodeAnalysis/EmptyPHPStatementUnitTest.2.inc.fixed

@@ -1,4 +1,4 @@
-<!-- Tests with short open echo tag. -->
+<!-- Tests with short open tag. -->
 
 <input name="<?something_else(); ?>" />
 <input name="<? something_else(); ?>" />