Deal around newline-only lines pruned to zero-lenght

Test for that, too

misc.c

@@ -352,7 +352,7 @@ char* get_input()
 
 bool silent_yes()
 {
-    bool outcome;
+    bool outcome = false;
 
     for (;;) {
         char* reply = get_input();
@@ -363,6 +363,11 @@ bool silent_yes()
             exit(EXIT_SUCCESS);
             // LCOV_EXCL_STOP
         }
+        if (strlen(reply) == 0) {
+            free(reply);
+            rspeak(PLEASE_ANSWER);
+            continue;
+        }
 
         char* firstword = (char*) xmalloc(strlen(reply) + 1);
         sscanf(reply, "%s", firstword);
@@ -398,7 +403,7 @@ bool yes(const char* question, const char* yes_response, const char* no_response
 /*  Print message X, wait for yes/no answer.  If yes, print Y and return true;
  *  if no, print Z and return false. */
 {
-    bool outcome;
+    bool outcome = false;
 
     for (;;) {
         speak(question);
@@ -412,6 +417,12 @@ bool yes(const char* question, const char* yes_response, const char* no_response
             // LCOV_EXCL_STOP
         }
 
+        if (strlen(reply) == 0) {
+            free(reply);
+            rspeak(PLEASE_ANSWER);
+            continue;
+        }
+
         char* firstword = (char*) xmalloc(strlen(reply) + 1);
         sscanf(reply, "%s", firstword);
 

tests/barehands.chk

@@ -273,6 +273,10 @@ With what?  Your bare hands?
 
 Please answer the question.
 
+> green
+
+Please answer the question.
+
 > n
 
 The dragon looks rather nasty.  You'd best not try to get by.

tests/barehands.log

@@ -50,6 +50,7 @@ drop bird
 extinguish dragon
 kill dragon
 
+green
 n
 kill dragon
 y

tests/illformed.chk

@@ -7,6 +7,12 @@ Please answer the question.
 
 Welcome to Adventure!!  Would you like instructions?
 
+> 
+
+Please answer the question.
+
+Welcome to Adventure!!  Would you like instructions?
+
 > y
 
 Somewhere nearby is Colossal Cave, where others have found fortunes in

tests/illformed.log

@@ -1,5 +1,6 @@
 ## Test for various cases not found in walkthroughs.
 foo
+
 y
 seed 1801426495
 version