Don't try to create text output if other renderers failed (fix regression)

Commit 49d7df6 added error handling,
but since that commit Tesseract used the text fallback if the user
selected output failed.

Signed-off-by: Stefan Weil <sw@weilnetz.de>

Author: stweil

src/api/tesseractmain.cpp

@@ -402,6 +402,7 @@ static void PreloadRenderers(
     renderers->push_back(new tesseract::TessOsdRenderer(outputbase));
 #endif  // ndef DISABLED_LEGACY_ENGINE
   } else {
+    bool error = false;
     bool b;
     api->GetBoolVariable("tessedit_create_hocr", &b);
     if (b) {
@@ -415,20 +416,22 @@ static void PreloadRenderers(
         delete renderer;
         tprintf("Error, could not create hOCR output file: %s\n",
                 strerror(errno));
+        error = true;
       }
     }
 
     api->GetBoolVariable("tessedit_create_alto", &b);
     if (b) {
-        tesseract::TessAltoRenderer* renderer =
-                new tesseract::TessAltoRenderer(outputbase);
-        if (renderer->happy()) {
-            renderers->push_back(renderer);
-        } else {
-            delete renderer;
-            tprintf("Error, could not create ALTO output file: %s\n",
-                    strerror(errno));
-        }
+      tesseract::TessAltoRenderer* renderer =
+              new tesseract::TessAltoRenderer(outputbase);
+      if (renderer->happy()) {
+        renderers->push_back(renderer);
+      } else {
+        delete renderer;
+        tprintf("Error, could not create ALTO output file: %s\n",
+                strerror(errno));
+        error = true;
+      }
     }
 
     api->GetBoolVariable("tessedit_create_tsv", &b);
@@ -443,6 +446,7 @@ static void PreloadRenderers(
         delete renderer;
         tprintf("Error, could not create TSV output file: %s\n",
                 strerror(errno));
+        error = true;
       }
     }
 
@@ -463,6 +467,7 @@ static void PreloadRenderers(
         delete renderer;
         tprintf("Error, could not create PDF output file: %s\n",
                 strerror(errno));
+        error = true;
       }
     }
 
@@ -477,6 +482,7 @@ static void PreloadRenderers(
         delete renderer;
         tprintf("Error, could not create UNLV output file: %s\n",
                 strerror(errno));
+        error = true;
       }
     }
 
@@ -490,11 +496,12 @@ static void PreloadRenderers(
         delete renderer;
         tprintf("Error, could not create BOX output file: %s\n",
                 strerror(errno));
+        error = true;
       }
     }
 
     api->GetBoolVariable("tessedit_create_txt", &b);
-    if (b || renderers->empty()) {
+    if (b || !error && renderers->empty()) {
       tesseract::TessTextRenderer* renderer =
         new tesseract::TessTextRenderer(outputbase);
       if (renderer->happy()) {