cinera_config.c: Prevent read access crash

Passing an empty string to StripSlashes() would crash.

Also add a conditional around the ctime calls in the Won Build System,
to only run it if it exists.

cinera/cinera.c

@@ -1,10 +1,16 @@
 #if 0
-ctime -begin ${0%.*}.ctm
+if [ $(command -v ctime 2>/dev/null) ]; then
+    ctime -begin ${0%.*}.ctm
+fi
+
 #gcc -g -fsanitize=address -Wall -std=c99 -pipe $0 -o ${0%.*} hmml.a -lcurl
 gcc -O2 -Wall -std=c99 -pipe $0 -o ${0%.*} hmml.a -lcurl
 #clang -fsanitize=address -g -Wall -std=c99 -pipe $0 -o ${0%.*} hmml.a -lcurl
 #clang -O2 -Wall -std=c99 -pipe $0 -o ${0%.*} hmml.a -lcurl
-ctime -end ${0%.*}.ctm
+
+if [ $(command -v ctime 2>/dev/null) ]; then
+    ctime -end ${0%.*}.ctm
+fi
 exit
 #endif
 
@@ -17,7 +23,7 @@ typedef struct
 version CINERA_APP_VERSION = {
     .Major = 0,
     .Minor = 7,
-    .Patch = 5
+    .Patch = 6
 };
 
 #include <stdarg.h> // NOTE(matt): varargs
@@ -10962,7 +10968,8 @@ typedef struct
 void
 OffsetAssociatedIndex(asset_index_and_location *AssetDeletionRecords, int AssetDeletionRecordCount, int32_t *Index)
 {
-    fprintf(stderr, "Possibly offsetting associated index\n");
+    // TODO(matt): Do we really need to print this?
+    //fprintf(stderr, "Possibly offsetting associated index\n");
     for(int i = AssetDeletionRecordCount - 1; i >= 0; --i)
     {
         if(*Index > AssetDeletionRecords[i].Index)

cinera/cinera_config.c

@@ -2908,19 +2908,22 @@ string
 StripSlashes(string Path, path_relativity Relativity)
 {
     string Result = Path;
-    if(Relativity == P_REL)
+    if(Path.Length > 0)
     {
-        while(*Result.Base == '/')
+        if(Relativity == P_REL)
+        {
+            while(*Result.Base == '/')
+            {
+                ++Result.Base;
+                --Result.Length;
+            }
+        }
+
+        while(Result.Base[Result.Length - 1] == '/')
         {
-            ++Result.Base;
             --Result.Length;
         }
     }
-
-    while(Result.Base[Result.Length - 1] == '/')
-    {
-        --Result.Length;
-    }
     return Result;
 }