Add zero-argument versions of logger methods

The add method already handled nil msg, but the main level methods
strictly required an argument.

Author: headius

src/main/java/org/jruby/rack/ext/Logger.java

@@ -290,6 +290,11 @@ public IRubyObject info(final ThreadContext context,
         return context.runtime.newBoolean( add(INFO, context, msg, block) );
     }
 
+    @JRubyMethod(name = "info")
+    public IRubyObject info(final ThreadContext context, final Block block) {
+        return info(context, context.nil, block);
+    }
+    
     //
     // Log a +WARN+ message.
     //
@@ -299,6 +304,11 @@ public IRubyObject warn(final ThreadContext context,
         return context.runtime.newBoolean( add(WARN, context, msg, block) );
     }
 
+    @JRubyMethod(name = "warn")
+    public IRubyObject warn(final ThreadContext context, final Block block) {
+        return warn(context, context.nil, block);
+    }
+
     //
     // Log a +ERROR+ message.
     //
@@ -308,6 +318,11 @@ public IRubyObject error(final ThreadContext context,
         return context.runtime.newBoolean( add(ERROR, context, msg, block) );
     }
 
+    @JRubyMethod(name = "error")
+    public IRubyObject error(final ThreadContext context, final Block block) {
+        return error(context, context.nil, block);
+    }
+
     //
     // Log a +FATAL+ message.
     //
@@ -317,6 +332,11 @@ public IRubyObject fatal(final ThreadContext context,
         return context.runtime.newBoolean( add(FATAL, context, msg, block) );
     }
 
+    @JRubyMethod(name = "fatal")
+    public IRubyObject fatal(final ThreadContext context, final Block block) {
+        return fatal(context, context.nil, block);
+    }
+
     //
     // Log an +UNKNOWN+ message.
     // This will be printed no matter what the logger's level is.
@@ -328,6 +348,11 @@ public IRubyObject unknown(final ThreadContext context,
         return context.runtime.newBoolean( add(UNKNOWN, context, msg, block) );
     }
 
+    @JRubyMethod(name = "unknown")
+    public IRubyObject unknown(final ThreadContext context, final Block block) {
+        return unknown(context, context.nil, block);
+    }
+
     // def add(severity, message = nil, progname = nil, &block)
     @JRubyMethod(name = "add", required = 1, optional = 2)
     public IRubyObject add(final ThreadContext context,