Fix info c <exp> when <exp> doesn't return a constant

Currently, the command `info c <exp>` crashes the debugger when <exp>` is
not a constant because it raises an exception. This patch fixes it by
changing it to `puts`.

This commit also adds 2 test cases for the `info c <exp>` usage.

Co-authored-by: Aiden Storey <git@storey.dev>

lib/debug/thread_client.rb

@@ -612,7 +612,7 @@ def get_consts expr = nil, only_self: false, &block
           iter_consts _self, &block
           return
         else
-          raise "#{_self.inspect} (by #{expr}) is not a Module."
+          puts "#{_self.inspect} (by #{expr}) is not a Module."
         end
       elsif _self = current_frame&.self
         cs = {}

test/console/info_test.rb

@@ -248,6 +248,38 @@ def test_info_constant_with_expression
         type "c"
       end
     end
+
+    def test_info_constant_with_expression_errors
+      debug_code(program) do
+        type "b 31"
+        type "c"
+        assert_line_num 31
+
+        type "info constants foo"
+        assert_line_text([
+          /eval error: undefined local variable or method `foo' for main/,
+          /.*/,
+          /nil \(by foo\) is not a Module./
+        ])
+
+        type "c"
+      end
+    end
+
+    def test_info_constant_with_non_module_expression
+      debug_code(program) do
+        type "b 31"
+        type "c"
+        assert_line_num 31
+
+        type "info constants 3"
+        assert_line_text([
+          /3 \(by 3\) is not a Module./
+        ])
+
+        type "c"
+      end
+    end
   end
 
   class InfoIvarsTest < ConsoleTestCase