Support "if" without "else" clause

Defaults the else clause to the identity filter "." if an else clause is
missing.

The following two jq programs are considered equivalent:

```
if .foo then
    .foo = "bar"
else
    .
end
```

```
if .foo then
    .foo = "bar"
end
```

src/parser.h

@@ -1,8 +1,8 @@
-/* A Bison parser, made by GNU Bison 3.0.4.  */
+/* A Bison parser, made by GNU Bison 3.0.5.  */
 
 /* Bison interface for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -40,7 +40,7 @@
 extern int yydebug;
 #endif
 /* "%code requires" blocks.  */
-#line 11 "src/parser.y" /* yacc.c:1909  */
+#line 11 "src/parser.y" /* yacc.c:1910  */
 
 #include "locfile.h"
 struct lexer_param;
@@ -57,7 +57,7 @@ struct lexer_param;
     }                                           \
   } while (0)
 
-#line 61 "src/parser.h" /* yacc.c:1909  */
+#line 61 "src/parser.h" /* yacc.c:1910  */
 
 /* Token type.  */
 #ifndef YYTOKENTYPE
@@ -163,12 +163,12 @@ struct lexer_param;
 
 union YYSTYPE
 {
-#line 31 "src/parser.y" /* yacc.c:1909  */
+#line 31 "src/parser.y" /* yacc.c:1910  */
 
   jv literal;
   block blk;
 
-#line 172 "src/parser.h" /* yacc.c:1909  */
+#line 172 "src/parser.h" /* yacc.c:1910  */
 };
 
 typedef union YYSTYPE YYSTYPE;

src/parser.y

@@ -357,6 +357,9 @@ Term "as" Patterns '|' Exp {
 "if" Exp "then" Exp ElseBody {
   $$ = gen_cond($2, $4, $5);
 } |
+"if" Exp "then" Exp "end" {
+  $$ = gen_cond($2, $4, gen_noop());
+} |
 "if" Exp "then" error {
   FAIL(@$, "Possibly unterminated 'if' statement");
   $$ = $2;

tests/jq.test

@@ -1036,6 +1036,19 @@ null
 null
 [5,6]
 
+[if true then 3 end]
+7
+[3]
+
+[if false then 3 end]
+7
+[7]
+
+[if false then 3 else . end]
+7
+[7]
+
+
 [.[] | [.foo[] // .bar]]
 [{"foo":[1,2], "bar": 42}, {"foo":[1], "bar": null}, {"foo":[null,false,3], "bar": 18}, {"foo":[], "bar":42}, {"foo": [null,false,null], "bar": 41}]
 [[1,2], [1], [3], [42], [41]]